diff --git a/clients/tools/common.c b/clients/tools/common.c
index 69ab796c3ea3284e5ba2151cc73aadf30f4773b8..86434283d8f21c40907cd1047d4140c4845b454e 100644
--- a/clients/tools/common.c
+++ b/clients/tools/common.c
@@ -247,8 +247,8 @@ N_("  -c         continuous operation mode (do not stop on errors)\n"),
 N_("  -d level   set LDAP debugging level to `level'\n"),
 N_("  -D binddn  bind DN\n"),
 N_("  -e [!]<ext>[=<extparam>] general extensions (! indicates criticality)\n")
-N_("             [!]assert=<filter>     (a RFC 4515 Filter string)\n")
-N_("             [!]authzid=<authzid>   (\"dn:<dn>\" or \"u:<user>\")\n")
+N_("             [!]assert=<filter>     (RFC 4528; a RFC 4515 Filter string)\n")
+N_("             [!]authzid=<authzid>   (RFC 4370; \"dn:<dn>\" or \"u:<user>\")\n")
 #ifdef LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ
 #if 0
                  /* non-advertized support for proxyDN */
@@ -260,13 +260,13 @@ N_("             [!]chaining[=<resolveBehavior>[/<continuationBehavior>]]\n")
 N_("                     one of \"chainingPreferred\", \"chainingRequired\",\n")
 N_("                     \"referralsPreferred\", \"referralsRequired\"\n")
 #endif /* LDAP_CONTROL_X_CHAINING_BEHAVIOR */
-N_("             [!]manageDSAit\n")
+N_("             [!]manageDSAit         (RFC 3296)\n")
 N_("             [!]noop\n")
 #ifdef LDAP_CONTROL_PASSWORDPOLICYREQUEST
 N_("             ppolicy\n")
 #endif
-N_("             [!]postread[=<attrs>]  (a comma-separated attribute list)\n")
-N_("             [!]preread[=<attrs>]   (a comma-separated attribute list)\n")
+N_("             [!]postread[=<attrs>]  (RFC 4527; comma-separated attr list)\n")
+N_("             [!]preread[=<attrs>]   (RFC 4527; comma-separated attr list)\n")
 N_("             [!]relax\n")
 #ifdef LDAP_CONTROL_X_SESSION_TRACKING
 N_("             [!]sessiontracking\n")
diff --git a/clients/tools/ldapsearch.c b/clients/tools/ldapsearch.c
index aeb56d036ad20ea80e85d1d2d21b1fb0e6fc68eb..1bb7ec8db8b2c5289fbac43475a0df8575844c59 100644
--- a/clients/tools/ldapsearch.c
+++ b/clients/tools/ldapsearch.c
@@ -126,12 +126,13 @@ usage( void )
 	fprintf( stderr, _("  -E [!]<ext>[=<extparam>] search extensions (! indicates criticality)\n"));
 	fprintf( stderr, _("             [!]domainScope              (domain scope)\n"));
 	fprintf( stderr, _("             !dontUseCopy                (Don't Use Copy)\n"));
-	fprintf( stderr, _("             [!]mv=<filter>              (matched values filter)\n"));
-	fprintf( stderr, _("             [!]pr=<size>[/prompt|noprompt]   (paged results/prompt)\n"));
-	fprintf( stderr, _("             [!]sss=[-]<attr[:OID]>[/[-]<attr[:OID]>...]   (server side sorting)\n"));
-	fprintf( stderr, _("             [!]subentries[=true|false]  (subentries)\n"));
-	fprintf( stderr, _("             [!]sync=ro[/<cookie>]            (LDAP Sync refreshOnly)\n"));
-	fprintf( stderr, _("                     rp[/<cookie>][/<slimit>] (LDAP Sync refreshAndPersist)\n"));
+	fprintf( stderr, _("             [!]mv=<filter>              (RFC 3876 matched values filter)\n"));
+	fprintf( stderr, _("             [!]pr=<size>[/prompt|noprompt] (RFC 2696 paged results/prompt)\n"));
+	fprintf( stderr, _("             [!]sss=[-]<attr[:OID]>[/[-]<attr[:OID]>...]\n"));
+	fprintf( stderr, _("                                         (RFC 2891 server side sorting)\n"));
+	fprintf( stderr, _("             [!]subentries[=true|false]  (RFC 3672 subentries)\n"));
+	fprintf( stderr, _("             [!]sync=ro[/<cookie>]       (RFC 4533 LDAP Sync refreshOnly)\n"));
+	fprintf( stderr, _("                     rp[/<cookie>][/<slimit>] (refreshAndPersist)\n"));
 	fprintf( stderr, _("             [!]<oid>=:<value>           (generic control; no response handling)\n"));
 	fprintf( stderr, _("  -F prefix  URL prefix for files (default: %s)\n"), def_urlpre);
 	fprintf( stderr, _("  -l limit   time limit (in seconds, or \"none\" or \"max\") for search\n"));