diff -uprk.orig shadow-4.0.4.1.orig/man/groupadd.8 shadow-4.0.4.1/man/groupadd.8
--- shadow-4.0.4.1.orig/man/groupadd.8	2004-11-10 21:19:33 +0300
+++ shadow-4.0.4.1/man/groupadd.8	2004-11-10 21:25:20 +0300
@@ -61,6 +61,11 @@ option too, the group creation will fall
 specified).
 .br
 This is an option added by Red Hat Software.
+.SH NOTES
+Group names must match [a-z_][a-z0-9_-]* regexp pattern.
+.SH CAVEATS
+You may not add a NIS or LDAP group. This must be performed on the
+corresponding server.
 .SH FILES
 \fI/etc/group\fR	\- group account information
 .br
diff -uprk.orig shadow-4.0.4.1.orig/man/useradd.8 shadow-4.0.4.1/man/useradd.8
--- shadow-4.0.4.1.orig/man/useradd.8	2004-11-10 21:19:33 +0300
+++ shadow-4.0.4.1/man/useradd.8	2004-11-10 21:24:50 +0300
@@ -139,11 +139,13 @@ all future new user accounts.
 If no options are specified, \fBuseradd\fR displays the current default
 values.
 .SH NOTES
+User names must match [a-z_][a-z0-9_-]* regexp pattern.
+
 The system administrator is responsible for placing the default user files
 in the \fI/etc/skel/\fR directory.
 .SH CAVEATS
-You may not add a user to an NIS group. This must be performed on the NIS
-server.
+You may not add a user to a NIS or LDAP group. This must be performed on the
+corresponding server.
 .SH FILES
 \fI/etc/passwd\fR			\- user account information
 .br