diff --git a/CHANGES b/CHANGES
index aca349b6f0..d1c59a78ab 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+2795.	[cleanup]	Add text to differentiate "update with no effect"
+			log messages. [RT #18889]
+
 2794.	[bug]		Install <isc/namespace.h>.  [RT #20677]
 
 2793.	[func]		Add "autosign" and "metadata" tests to the
diff --git a/lib/dns/diff.c b/lib/dns/diff.c
index e38fbb3bd3..32f9a69bb8 100644
--- a/lib/dns/diff.c
+++ b/lib/dns/diff.c
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: diff.c,v 1.22 2009/11/25 02:30:54 each Exp $ */
+/* $Id: diff.c,v 1.23 2009/12/01 00:47:09 each Exp $ */
 
 /*! \file */
 
@@ -399,9 +399,9 @@ diff_apply(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *ver,
 							      sizeof(classbuf));
 					isc_log_write(DIFF_COMMON_LOGARGS,
 						      ISC_LOG_WARNING,
-						      "%s/%s: update with no "
-						      "effect", namebuf,
-						      classbuf);
+						      "%s/%s: dns_diff_apply: "
+						      "update with no effect",
+						      namebuf, classbuf);
 				}
 			} else if (result == DNS_R_NXRRSET) {
 				/*
@@ -490,6 +490,7 @@ dns_diff_load(dns_diff_t *diff, dns_addrdatasetfunc_t addfunc,
 			if (result == DNS_R_UNCHANGED) {
 				isc_log_write(DIFF_COMMON_LOGARGS,
 					      ISC_LOG_WARNING,
+					      "dns_diff_load: "
 					      "update with no effect");
 			} else if (result == ISC_R_SUCCESS ||
 				   result == DNS_R_NXRRSET) {