Index: chan_sip.c
===================================================================
--- chan_sip.c	(revision 89441)
+++ chan_sip.c	(working copy)
@@ -12213,8 +12213,8 @@
 	case CLI_INIT:
 		e->command = "sip show history";
 		e->usage =
-			"Usage: sip show history <channel>\n"
-			"       Provides detailed dialog history on a given SIP channel.\n";
+			"Usage: sip show history <call-id>\n"
+			"       Provides detailed dialog history on a given SIP Call ID.\n";
 		return NULL;
 	case CLI_GENERATE:
 		return complete_sip_show_history(a->line, a->word, a->pos, a->n);