--- Libc/Libc-262/string/strdup.3
+++ Libc/Libc-583/string/strdup.3
@@ -43,14 +43,16 @@
 .Sh SYNOPSIS
 .In string.h
 .Ft char *
-.Fn strdup "const char *str"
+.Fo strdup
+.Fa "const char *s1"
+.Fc
 .Sh DESCRIPTION
 The
 .Fn strdup
 function
 allocates sufficient memory for a copy
 of the string
-.Fa str ,
+.Fa s1 ,
 does the copy, and returns a pointer to it.
 The pointer may subsequently be used as an
 argument to the function