diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index b5fdfe98..16780097 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1591,6 +1591,7 @@ XML:
   - .kml
   - .mxml
   - .plist
+  - .pluginspec
   - .ps1xml
   - .psc1
   - .pt