diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index f03bacd8..d9605cc5 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -862,6 +862,14 @@ SQL:
   extensions:
   - .sql
 
+Sage:
+  type: programming
+  lexer: Python
+  group: Python
+  primary_extension: .sage
+  extensions:
+  - .sage
+
 Sass:
   type: markup
   group: CSS