diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 11086f22..a3ce528f 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -51,6 +51,7 @@ APL:
   color: "#8a0707"
   extensions:
   - .apl
+  - .dyalog
 
 ASP:
   type: programming