diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 01f4b4cd..6eb2a378 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -492,6 +492,9 @@ Dylan:
   type: programming
   color: "#3ebc27"
   primary_extension: .dylan
+  extensions:
+  - .intr
+  - .lid
 
 Ecere Projects:
   type: data