diff --git a/etc/login.defs b/etc/login.defs
index eba4bde7..f235e1b4 100644
--- a/etc/login.defs
+++ b/etc/login.defs
@@ -31,6 +31,15 @@ LOG_OK_LOGINS		no
 #
 LASTLOG_ENAB		yes
 
+#
+# Limit the highest user ID number for which the lastlog entries should
+# be updated.
+#
+# No LASTLOG_UID_MAX means that there is no user ID limit for writing
+# lastlog entries.
+#
+#LASTLOG_UID_MAX
+
 #
 # Enable checking and display of mailbox status upon login.
 #
@@ -332,8 +341,8 @@ CHFN_RESTRICT		rwh
 # If only one of the MIN or MAX values is set, then this value will be used.
 # If MIN > MAX, the highest value will be used.
 #
-# SHA_CRYPT_MIN_ROUNDS 5000
-# SHA_CRYPT_MAX_ROUNDS 5000
+#SHA_CRYPT_MIN_ROUNDS 5000
+#SHA_CRYPT_MAX_ROUNDS 5000
 
 #
 # List of groups to add to the user's supplementary group set
diff --git a/src/usermod.c b/src/usermod.c
index c3718864..0ae50e34 100644
--- a/src/usermod.c
+++ b/src/usermod.c
@@ -1879,7 +1879,7 @@ static void update_lastlog (void)
 		return;
 	}
 
-	max_uid = (uid_t) getdef_ulong ("LASTLOG_MAX_UID", 0xFFFFFFFFUL);
+	max_uid = (uid_t) getdef_ulong ("LASTLOG_UID_MAX", 0xFFFFFFFFUL);
 	if (user_newid > max_uid) {
 		/* do not touch lastlog for large uids */
 		return;