diff --git a/src/or/command.c b/src/or/command.c
index 0e89b70a091eb31f475f2dc82a1922254925b49e..0a6ec559bb7e43a46b8bcdf423468ffac180ae06 100644
--- a/src/or/command.c
+++ b/src/or/command.c
@@ -158,7 +158,8 @@ static void command_process_relay_cell(cell_t *cell, connection_t *conn) {
   circ = circuit_get_by_circ_id_conn(cell->circ_id, conn);
 
   if(!circ) {
-    log_fn(LOG_INFO,"unknown circuit %d. Dropping.", cell->circ_id);
+    log_fn(LOG_INFO,"unknown circuit %d on connection to %s:%d. Dropping.",
+           cell->circ_id, conn->address, conn->port);
     return;
   }
 
@@ -189,7 +190,8 @@ static void command_process_destroy_cell(cell_t *cell, connection_t *conn) {
   circ = circuit_get_by_circ_id_conn(cell->circ_id, conn);
 
   if(!circ) {
-    log_fn(LOG_INFO,"unknown circuit %d. Dropping.", cell->circ_id);
+    log_fn(LOG_INFO,"unknown circuit %d on connection to %s:%d. Dropping.",
+           cell->circ_id, conn->address, conn->port);
     return;
   }