diff --git a/README.md b/README.md
index 835736494..83997c4e9 100644
--- a/README.md
+++ b/README.md
@@ -193,7 +193,7 @@ following syntax:
 
 ```yaml
 custom_rules:
-  pirate_beat_ninjas: # rule identifier
+  pirates_beat_ninjas: # rule identifier
     name: "Pirates Beat Ninjas" # rule name. optional.
     regex: "([n,N]inja)" # matching pattern
     match_kinds: # SyntaxKinds to match. optional.