diff --git a/runtime/syntax/dockerfile.yaml b/runtime/syntax/dockerfile.yaml
index ef48034f..ea7aa7b9 100644
--- a/runtime/syntax/dockerfile.yaml
+++ b/runtime/syntax/dockerfile.yaml
@@ -1,7 +1,7 @@
 filetype: dockerfile
 
 detect:
-    filename: "(Dockerfile[^/]*$|\\.dockerfile$)"
+    filename: "((Docker|Container)file[^/]*$|\\.(docker|container)file$)"
 
 rules:
     ## Keywords