diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 70302378..a6aa21e0 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1553,6 +1553,7 @@ Python:
   extensions:
   - .gyp
   - .lmi
+  - .pyde
   - .pyt
   - .pyw
   - .wsgi