diff --git a/binary-exploitation/format-strings/README.md b/binary-exploitation/format-strings/README.md
index 13fb590d6..01d854c24 100644
--- a/binary-exploitation/format-strings/README.md
+++ b/binary-exploitation/format-strings/README.md
@@ -87,7 +87,7 @@ and you would read from the first to the forth param.
 Or you could do:
 
 ```c
-printf("$4%x")
+printf("%4$x")
 ```
 
 and read directly the forth.