Builtins.md

@@ -57,10 +57,10 @@ All other pointers are printed in lowercase hexadecimal, without any preceding '
 ## input
 
 ```
-String input(uint8* str = null);
+String input();
 ```
 
-Gets the next line from stdin.  If `str` is not null, then it is printed without a newline first.
+Gets the next line from stdin.
 
 ## tostring, toint64, touint64