diff --git a/README.md b/README.md
index 2f45fc8..abfd20c 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ Call/restart `python server.py` when any Python file in the current directory (a
 
 Call/restart `my_server` when any file in the current directory (and all subdirectories) changes, sending `SIGKILL` to stop the child process:
 
-    $ watchexec -r -k my_server
+    $ watchexec -r -s SIGKILL my_server
 
 Run `make` when any file changes, using the `.gitignore` file in the current directory to filter: