diff --git a/frontend/dockerfile/docs/reference.md b/frontend/dockerfile/docs/reference.md
index 6d57c4227337..42432a26a575 100644
--- a/frontend/dockerfile/docs/reference.md
+++ b/frontend/dockerfile/docs/reference.md
@@ -514,7 +514,7 @@ They're equivalent to the following line:
 RUN source $HOME/.bashrc && echo $HOME
 ```
 
-You can also use heredocs with the shell form to break up a command:
+You can also use heredocs with the shell form to break up supported commands.
 
 ```dockerfile
 RUN <<EOF