diff --git a/CHANGES b/CHANGES
index 71e325bd71817c5d48f4cfe34cd24113c439e898..7e7dec1499b0bb6bd5e75755af382676f72dd316 100644
--- a/CHANGES
+++ b/CHANGES
@@ -144,7 +144,7 @@ DAHDI Changes
    and a 'full' buffer policy for a fax transmission, add:
      faxbuffers=>6,full
    The faxbuffers configuration will be in affect until the call is torn down.
- * Added service message support for 4ess/5ess switches.
+ * Added service message support for 4ESS/5ESS switches.
 
 Dialplan Functions
 ------------------
diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index adc7e510a03478ae197e345dfc6d569df9510011..c380fd2282892a8a51368a0d84e948eded2dc7dc 100644
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -13860,7 +13860,7 @@ static char *handle_pri_service_generic(struct ast_cli_entry *e, int cmd, struct
 	while (tmp) {
 		if (tmp->pri && tmp->channel == channel) {
 			if (!tmp->pri->enable_service_message_support) {
-				ast_cli(fd, "\n\tThis operation has not been enabled in chan_dahdi.conf, set 'service_message_support=yes' to use this operation.\n\tNote only 4ess and 5ess switch types are supported.\n\n");
+				ast_cli(fd, "\n\tThis operation has not been enabled in chan_dahdi.conf, set 'service_message_support=yes' to use this operation.\n\tNote only 4ESS and 5ESS switch types are supported.\n\n");
 				return CLI_SUCCESS;
 			}
 			why = -1;