Heiman, J.
The defendants appeal1 pursuant to General Statutes § 31-301b2 from the decision of the compensation review division of the workers’ compensation commission3 affirming the decision of the workers’ compensation commissioner for the fourth district ordering CNA Insurance Company to pay benefits and all reasonable and necessary medical expenses to the plaintiff John Muldoon pursuant to General Statutes § 31-299b.4 On appeal, the defendants assert that the review division improperly concluded that the claims [697]*697for increased and total disability were not barred by a prior stipulation.5 We reverse the decision of the review division.
The following facts are necessary for a proper resolution of this issue. The plaintiff began working around asbestos in 1947. In 1975, he filed a claim for workers’ compensation benefits for pulmonary asbestosis that caused a 50 percent respiratory disability arising out of asbestos exposure from 1947 to 1974. One of the defendants named in that claim was Cummings Insulation Company. On March 31, 1977, the parties settled the claim and agreed that payments were “in full accord and satisfaction of a disputed claim” and “shall be made and accepted as a full and final settlement for all compensation for said injury and for all results upon the [plaintiff], past, present and future, and for all claims for past, present and future medical, surgical, hospital and incidental expenses and all compensation which may be due to anyone in case of the death of the [plaintiff], to the end that the payment of such sum shall constitute a complete satisfaction of all claims due or to become due at any time in favor of anybody on account of the claimed injury, or on account of any condition in any way resulting out of the said injury, or on account of the death of the [plaintiff] on account of said condition.” The settlement further stated that the plaintiff understood the agreement to be a “full and final settlement and that it is intended to deal with any and all conditions, known or unknown, which exist as of the date thereof, or any changes of conditions which may arise in the future on account of said alleged occupational disease occurring between 1947 and 1974.”
[698]*698On December 12,1986, the plaintiff filed a claim for workers’ compensation benefits for intestinal cancer arising out of asbestos exposure from 1947 to 1984. On June 23, 1987, the plaintiff filed a second claim for workers’ compensation benefits for increased pulmonary asbestosis that caused a 75 percent respiratory disability arising out of asbestos exposure from 1975 to 1984.6 On May 24, 1989, the only medical report referring to the plaintiffs post-1984 lung condition was filed with the commissioner. The report stated that the increased pulmonary disability was a “progression” of the same disease. On April 26,1991, the workers’ compensation commissioner for the fourth district found that the plaintiff “developed a substantial increase in his pulmonary disability.” The commissioner further found that the exposure to asbestos from 1975 through 1984 was a “substantial causal factor” in the “substantial increase” of his pulmonary disability.7 On the basis of this finding, the commissioner ordered the defendants to pay the plaintiff benefits pursuant to § 31-299b.
The defendants appealed the commissioner’s decision to the review division without presenting additional evidence. The review division affirmed the commissioner’s decision and stated, in relevant part, that the stipulation among the parties did not prohibit the claim because the increased pulmonary disability “constituted new evidence of a new injury.” The defendants appealed from this decision.
We must first determine whether the review division properly found that the increased pulmonary disability “constituted new evidence of a new injury” when the commissioner found that the increased pulmonary [699]*699disability was a “substantial increase” from the old injury. Determining whether an injury was a substantial increase from a preexisting injury or was a new injury is a question of fact for the commissioner. See Crochiere v. Board of Education, 227 Conn. 333, 346, 630 A.2d 1027 (1993); Fair v. People’s Savings Bank, 207 Conn. 535, 539, 542 A.2d 1118 (1988); Mellor v. Pleasure Valley Mobile Homes, 11 Conn. Workers’ Comp. Rev. Op. 270, 271 (1993); Glynn v. Terry Corp., 8 Conn. Workers’ Comp. Rev. Op. 87, 88 (1990). “It is clear that under General Statutes § 31-301 (a) and § 31-301-88 of the Regulations of Connecticut State Agencies the review division’s hearing of an appeal from the commissioner is not a de novo hearing of the facts.” Fair v. People’s Savings Bank, supra, 538. “[I]t is obliged to hear the appeal on the record and not ‘retry the facts.’ . . . [T]he power and duty of determining the facts rests on the commissioner, the trier of facts. . . . [T]he conclusions drawn by him from the facts found must stand unless they result from an incorrect application of the law to the subordinate facts or from an inference illegally or unreasonably drawn from them. ...” (Citations omitted; internal quotation marks omitted.) Crochiere v. Board of Education, supra, 347. The commissioner’s finding that the disability was a “substantial increase” [700]*700from the old injury was supported by the facts and the review division should not have substituted its finding that the disability was a “new injury.”
We must next determine whether the review division properly affirmed the commissioner based on the commissioner’s findings that the injury was a substantial increase resulting from the old injury. Our scope of review of the actions of the review division is limited to a determination of whether “[t]he decision of the review division [was] correct in law, and it must not include facts found without evidence or fail to include material facts which are admitted or undisputed.” DeBarros v. Singleton, 21 Conn. App. 107, 110, 572 A.2d 69, cert. denied, 215 Conn. 808, 576 A.2d 538 (1990) ; see Vanzant v. Hall, 219 Conn. 674, 677, 594 A.2d 967 (1991). A settlement agreement is a contract among the parties. Bryan v. Reynolds, 143 Conn. 456, 460, 123 A.2d 192 (1956). “ ‘Normally, a determination of what the parties intended by contractual commitments is “a question of fact, reversible only if the trier of fact could not reasonably have arrived at the conclusion it had reached”; Thompson & Peck, Inc. v. Harbor Marine Contracting Corporation, [203 Conn. 123, 130, 523 A.2d 1266 (1987)]; but “[w]here there is definitive contract language, the determination of what the parties intended by their contractual commitments is a question of law.” Id., 131. “Terms cannot be added to a contract by interpretation.”
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Heiman, J.
The defendants appeal1 pursuant to General Statutes § 31-301b2 from the decision of the compensation review division of the workers’ compensation commission3 affirming the decision of the workers’ compensation commissioner for the fourth district ordering CNA Insurance Company to pay benefits and all reasonable and necessary medical expenses to the plaintiff John Muldoon pursuant to General Statutes § 31-299b.4 On appeal, the defendants assert that the review division improperly concluded that the claims [697]*697for increased and total disability were not barred by a prior stipulation.5 We reverse the decision of the review division.
The following facts are necessary for a proper resolution of this issue. The plaintiff began working around asbestos in 1947. In 1975, he filed a claim for workers’ compensation benefits for pulmonary asbestosis that caused a 50 percent respiratory disability arising out of asbestos exposure from 1947 to 1974. One of the defendants named in that claim was Cummings Insulation Company. On March 31, 1977, the parties settled the claim and agreed that payments were “in full accord and satisfaction of a disputed claim” and “shall be made and accepted as a full and final settlement for all compensation for said injury and for all results upon the [plaintiff], past, present and future, and for all claims for past, present and future medical, surgical, hospital and incidental expenses and all compensation which may be due to anyone in case of the death of the [plaintiff], to the end that the payment of such sum shall constitute a complete satisfaction of all claims due or to become due at any time in favor of anybody on account of the claimed injury, or on account of any condition in any way resulting out of the said injury, or on account of the death of the [plaintiff] on account of said condition.” The settlement further stated that the plaintiff understood the agreement to be a “full and final settlement and that it is intended to deal with any and all conditions, known or unknown, which exist as of the date thereof, or any changes of conditions which may arise in the future on account of said alleged occupational disease occurring between 1947 and 1974.”
[698]*698On December 12,1986, the plaintiff filed a claim for workers’ compensation benefits for intestinal cancer arising out of asbestos exposure from 1947 to 1984. On June 23, 1987, the plaintiff filed a second claim for workers’ compensation benefits for increased pulmonary asbestosis that caused a 75 percent respiratory disability arising out of asbestos exposure from 1975 to 1984.6 On May 24, 1989, the only medical report referring to the plaintiffs post-1984 lung condition was filed with the commissioner. The report stated that the increased pulmonary disability was a “progression” of the same disease. On April 26,1991, the workers’ compensation commissioner for the fourth district found that the plaintiff “developed a substantial increase in his pulmonary disability.” The commissioner further found that the exposure to asbestos from 1975 through 1984 was a “substantial causal factor” in the “substantial increase” of his pulmonary disability.7 On the basis of this finding, the commissioner ordered the defendants to pay the plaintiff benefits pursuant to § 31-299b.
The defendants appealed the commissioner’s decision to the review division without presenting additional evidence. The review division affirmed the commissioner’s decision and stated, in relevant part, that the stipulation among the parties did not prohibit the claim because the increased pulmonary disability “constituted new evidence of a new injury.” The defendants appealed from this decision.
We must first determine whether the review division properly found that the increased pulmonary disability “constituted new evidence of a new injury” when the commissioner found that the increased pulmonary [699]*699disability was a “substantial increase” from the old injury. Determining whether an injury was a substantial increase from a preexisting injury or was a new injury is a question of fact for the commissioner. See Crochiere v. Board of Education, 227 Conn. 333, 346, 630 A.2d 1027 (1993); Fair v. People’s Savings Bank, 207 Conn. 535, 539, 542 A.2d 1118 (1988); Mellor v. Pleasure Valley Mobile Homes, 11 Conn. Workers’ Comp. Rev. Op. 270, 271 (1993); Glynn v. Terry Corp., 8 Conn. Workers’ Comp. Rev. Op. 87, 88 (1990). “It is clear that under General Statutes § 31-301 (a) and § 31-301-88 of the Regulations of Connecticut State Agencies the review division’s hearing of an appeal from the commissioner is not a de novo hearing of the facts.” Fair v. People’s Savings Bank, supra, 538. “[I]t is obliged to hear the appeal on the record and not ‘retry the facts.’ . . . [T]he power and duty of determining the facts rests on the commissioner, the trier of facts. . . . [T]he conclusions drawn by him from the facts found must stand unless they result from an incorrect application of the law to the subordinate facts or from an inference illegally or unreasonably drawn from them. ...” (Citations omitted; internal quotation marks omitted.) Crochiere v. Board of Education, supra, 347. The commissioner’s finding that the disability was a “substantial increase” [700]*700from the old injury was supported by the facts and the review division should not have substituted its finding that the disability was a “new injury.”
We must next determine whether the review division properly affirmed the commissioner based on the commissioner’s findings that the injury was a substantial increase resulting from the old injury. Our scope of review of the actions of the review division is limited to a determination of whether “[t]he decision of the review division [was] correct in law, and it must not include facts found without evidence or fail to include material facts which are admitted or undisputed.” DeBarros v. Singleton, 21 Conn. App. 107, 110, 572 A.2d 69, cert. denied, 215 Conn. 808, 576 A.2d 538 (1990) ; see Vanzant v. Hall, 219 Conn. 674, 677, 594 A.2d 967 (1991). A settlement agreement is a contract among the parties. Bryan v. Reynolds, 143 Conn. 456, 460, 123 A.2d 192 (1956). “ ‘Normally, a determination of what the parties intended by contractual commitments is “a question of fact, reversible only if the trier of fact could not reasonably have arrived at the conclusion it had reached”; Thompson & Peck, Inc. v. Harbor Marine Contracting Corporation, [203 Conn. 123, 130, 523 A.2d 1266 (1987)]; but “[w]here there is definitive contract language, the determination of what the parties intended by their contractual commitments is a question of law.” Id., 131. “Terms cannot be added to a contract by interpretation.” Connecticut Union of Telephone Workers v. Southern New England Telephone, 148 Conn. 192, 200, 169 A.2d 646 (1961).’ Gaynor Electric Co. v. Hollander, 29 Conn. App. 865, 872-73, 618 A.2d 532 (1993); Bank of Boston Connecticut v. Schlesinger, 220 Conn. 152, 158, 595 A.2d 872 (1991) .” Rosick v. Equipment Maintenance & Service, Inc., 33 Conn. App. 25, 38, 632 A.2d 1134 (1993). The settlement agreement states that the payments “shall [701]*701be made and accepted as a full and final settlement for all compensation for said injury and for all results upon the claimant, past, present and future, and for all claims for past, present and future medical, surgical, hospital and incidental expenses . . . to the end that the payment of such sum shall constitute a complete satisfaction of all claims due or to become due at any time in favor of anybody on account of the claimed injury, or on account of any condition in any way resulting out of the said injury . . . .” (Emphasis added.) The settlement further states that the claimant understood the settlement “to deal with any and all conditions, known or unknown, which exist as of the date thereof, or any changes of conditions which may arise in the future on account of said alleged occupational disease . . . .” On the basis of the contract language, the parties intended, as a matter of law, to have the settlement resolve any claim for an increase in disability resulting from asbestosis of the lung. A settlement agreement resolves “the entire case, including claims both known and unknown, and both certain and uncertain. . . . Obviously, if injuries worsen as time passes, damages will increase, and, if injuries mend, damages will decrease. These are the vagaries of . . . settlement.” Lutynski v. B. B. & J. Trucking, Inc., 31 Conn. App. 806, 813, 628 A.2d 1, cert. granted on other grounds, 227 Conn. 914, 632 A.2d 692 (1993). Since the commissioner found that the claimed injury was an increase in the disability and not a “new” injury, the plaintiff was precluded by his contract from collecting further compensation for the injury.
The decision of the review division is reversed and the case is remanded with direction to sustain the appeal of the defendants.
In this opinion the other judges concurred.