--- Libc/Libc-583/string/strspn.3
+++ Libc/Libc-262.2.12/string/strspn.3
@@ -47,20 +47,17 @@
 .Sh SYNOPSIS
 .In string.h
 .Ft size_t
-.Fo strspn
-.Fa "const char *s1"
-.Fa "const char *s2"
-.Fc
+.Fn strspn "const char *s" "const char *charset"
 .Sh DESCRIPTION
 The
 .Fn strspn
 function
 spans the initial part of the null-terminated string
-.Fa s1 ,
+.Fa s
 as long as the characters from
-.Fa s1
+.Fa s
 occur in string
-.Fa s2 .
+.Fa charset .
 .Sh RETURN VALUES
 The
 .Fn strspn