diff --git a/language.go b/language.go
index 74d982f..ba9532b 100644
--- a/language.go
+++ b/language.go
@@ -274,6 +274,8 @@ var Exts = map[string]string{
 	"r":           "R",
 	"R":           "R",
 	"raml":        "RAML",
+	"re":          "Reason",
+	"rei":         "Reason",
 	"Rebol":       "Rebol",
 	"red":         "Red",
 	"rego":        "Rego",
@@ -652,6 +654,7 @@ func NewDefinedLanguages() *DefinedLanguages {
 			"Q":                   NewLanguage("Q", []string{"/ "}, [][]string{{"\\", "/"}, {"/", "\\"}}),
 			"QML":                 NewLanguage("QML", []string{"//"}, [][]string{{"/*", "*/"}}),
 			"R":                   NewLanguage("R", []string{"#"}, [][]string{{"", ""}}),
+			"Reason":              NewLanguage("Reason", []string{"//"}, [][]string{{"/*", "*/"}}),
 			"Rebol":               NewLanguage("Rebol", []string{";"}, [][]string{{"", ""}}),
 			"Red":                 NewLanguage("Red", []string{";"}, [][]string{{"", ""}}),
 			"Rego":                NewLanguage("Rego", []string{"#"}, [][]string{{"", ""}}),