diff --git a/README.md b/README.md
index 47ec865..629a4ad 100644
--- a/README.md
+++ b/README.md
@@ -137,8 +137,8 @@ The result output from cwc can also be piped to other commands as well. This exa
 
 ```sh
 # generate a commit message for current changes
-PROMPT="please write me a conventional commit for these changes"
-git diff HEAD | cwc $PROMPT | git commit -e --file -
+CWC_PROMPT="please write me a conventional commit for these changes"
+git diff HEAD | cwc $CWC_PROMPT | git commit -e --file -
 ```
 
 ## Configuration