diff --git a/lib/event/app.c b/lib/event/app.c
index 160c2cadb..f252999e4 100644
--- a/lib/event/app.c
+++ b/lib/event/app.c
@@ -890,6 +890,7 @@ usage(void (*app_usage)(void))
 	printf("     --base-virtaddr <addr>      the base virtual address for DPDK (default: 0x200000000000)\n");
 	printf("     --num-trace-entries <num>   number of trace entries for each core, must be power of 2, setting 0 to disable trace (default %d)\n",
 	       SPDK_APP_DEFAULT_NUM_TRACE_ENTRIES);
+	printf("                                 Tracepoints vary in size and can use more than one trace entry.\n");
 	printf("     --rpcs-allowed	   comma-separated list of permitted RPCS\n");
 	printf("     --env-context         Opaque context for use of the env implementation\n");
 	printf("     --vfio-vf-token       VF token (UUID) shared between SR-IOV PF and VFs for vfio_pci driver\n");