diff --git a/contrib/pgbench/pgbench.c b/contrib/pgbench/pgbench.c
index a836acfae98..7c1e59e4c4a 100644
--- a/contrib/pgbench/pgbench.c
+++ b/contrib/pgbench/pgbench.c
@@ -368,7 +368,7 @@ usage(void)
 		   "  -R, --rate=NUM           target rate in transactions per second\n"
 		   "  -s, --scale=NUM          report this scale factor in output\n"
 		   "  -S, --select-only        perform SELECT-only transactions\n"
-		   "  -t, --transactions       number of transactions each client runs (default: 10)\n"
+		   "  -t, --transactions=NUM   number of transactions each client runs (default: 10)\n"
 		   "  -T, --time=NUM           duration of benchmark test in seconds\n"
 		   "  -v, --vacuum-all         vacuum all four standard tables before tests\n"
 		   "  --aggregate-interval=NUM aggregate data over NUM seconds\n"