diff --git a/RELNOTES b/RELNOTES
index fb0ba661..e50922d0 100644
--- a/RELNOTES
+++ b/RELNOTES
@@ -54,8 +54,12 @@ by Eric Young (eay@cryptsoft.com).
 
 			Changes since 4.3.3
 
+- Added the lease address to the end of the debug level log message
+  emitted when an existing lease is renewed within the dhcp-cache-threshold.
+  [ISC-Bugs #40598]
+
 - Corrected compilation errors that prohibited building the server
-  and its ATF unit tests when failover disabled.
+  and its ATF unit tests when failover is disabled.
   [ISC-Bugs #40372]
 
 - Fixed several potential null references.  Thanks to Bill Parker
diff --git a/server/dhcp.c b/server/dhcp.c
index 7ebcfeb1..5969895c 100644
--- a/server/dhcp.c
+++ b/server/dhcp.c
@@ -5259,8 +5259,8 @@ reuse_lease (struct packet* packet,
 				/* We're cleared to reuse it */
 				log_debug("reuse_lease: lease age %ld (secs)"
 					  " under %d%% threshold, reply with "
-					  "unaltered, existing lease",
-					  lease_age, thresh);
+					  "unaltered, existing lease for %s",
+					  lease_age, thresh, piaddr(lease->ip_addr));
 
 				reusable = 1;
 			}