diff --git a/doc/cheat.txt b/doc/cheat.txt
index 40dfc0e..8de8a44 100644
--- a/doc/cheat.txt
+++ b/doc/cheat.txt
@@ -627,7 +627,7 @@ socket/receive-timeout
 ** Regular expressions
 
 (string-match regexp string [start]) -> match or false
-(regexp-match obj) -> boolean
+(regexp-match? obj) -> boolean
 (match:start match [match-number]) -> fixnum
 (match:end match [match-number]) -> fixnum
 (match:substring match [match-number]) -> string