diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 4f6e832aac..f25c7c7a5c 100755
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1110,6 +1110,9 @@ Dockerfile:
   - ".dockerfile"
   filenames:
   - Dockerfile
+  - "dockerfile"
+  - "Dockerfile.*"
+  - "dockerfile.*"
   ace_mode: dockerfile
   codemirror_mode: dockerfile
   codemirror_mime_type: text/x-dockerfile