diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 49797109..d99180c4 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -295,9 +295,10 @@ Befunge:
 
 Bison:
   type: programming
+  group: Yacc
   tm_scope: source.bison
   extensions:
-  - .y
+  - .bison
   ace_mode: text
 
 BitBake:
@@ -3581,6 +3582,15 @@ YAML:
   - .yaml
   ace_mode: yaml
 
+Yacc:
+  type: programming
+  extensions:
+  - .y
+  - .yacc
+  - .yy
+  tm_scope: source.bison
+  ace_mode: text
+
 Zephir:
   type: programming
   color: "#118f9e"