diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index c60b63dd..09f4641c 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -316,6 +316,10 @@ DCPU-16 ASM:
 
 Diff:
   primary_extension: .diff
+  
+DOT:
+  type: programming
+  primary_extension: .dot
 
 Dylan:
   type: programming