diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index f35c057b..51b3c0a0 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -747,6 +747,8 @@ JSON:
   - .sublime_session
   - .sublime-settings
   - .sublime-workspace
+  filenames:
+  - composer.lock
 
 Jade:
   group: HTML