diff --git a/app/iscsi_tgt/iscsi_tgt.c b/app/iscsi_tgt/iscsi_tgt.c
index fcf3cbccf..7ff3a5436 100644
--- a/app/iscsi_tgt/iscsi_tgt.c
+++ b/app/iscsi_tgt/iscsi_tgt.c
@@ -92,11 +92,7 @@ usage(char *executable_name)
 	printf(" -n channel number of memory channels used for DPDK\n");
 	printf(" -p core    master (primary) core for DPDK\n");
 	printf(" -s size    memory size in MB for DPDK\n");
-#ifdef DEBUG
-	printf(" -t flag    trace flag (all, net, iscsi, scsi, target, debug)\n");
-#else
-	printf(" -t flag    trace flag (not supported - must rebuild with CONFIG_DEBUG=y)\n");
-#endif
+	spdk_tracelog_usage(stdout, "-t");
 	printf(" -v         verbose (enable warnings)\n");
 	printf(" -H         show this usage\n");
 	printf(" -V         show version\n");
diff --git a/app/nvmf_tgt/nvmf_tgt.c b/app/nvmf_tgt/nvmf_tgt.c
index ca9dc3e74..3131010f6 100644
--- a/app/nvmf_tgt/nvmf_tgt.c
+++ b/app/nvmf_tgt/nvmf_tgt.c
@@ -104,11 +104,8 @@ usage(void)
 	printf(" -p core    master (primary) core for DPDK\n");
 	printf(" -s size    memory size in MB for DPDK\n");
 
-#ifdef DEBUG
-	printf(" -t flag    - trace flag options (all, rdma, nvmf, debug)\n");
-#else
-	printf(" -t flag    - trace flag options (not supported - must rebuild with CONFIG_DEBUG=y)\n");
-#endif
+	spdk_tracelog_usage(stdout, "-t");
+
 	printf(" -v         - verbose (enable warnings)\n");
 	printf(" -H         - show this usage\n");
 	printf(" -d         - disable coredump file enabling\n");
diff --git a/include/spdk/log.h b/include/spdk/log.h
index 8b01b52d9..e3b05182c 100644
--- a/include/spdk/log.h
+++ b/include/spdk/log.h
@@ -111,4 +111,6 @@ const char *spdk_log_get_trace_flag_name(size_t idx);
 void spdk_open_log(void);
 void spdk_close_log(void);
 
+void spdk_tracelog_usage(FILE *f, const char *trace_arg);
+
 #endif /* SPDK_LOG_H */
diff --git a/lib/log/log.c b/lib/log/log.c
index 02db58f35..e16e948ad 100644
--- a/lib/log/log.c
+++ b/lib/log/log.c
@@ -375,3 +375,22 @@ spdk_close_log(void)
 {
 	closelog();
 }
+
+void
+spdk_tracelog_usage(FILE *f, const char *trace_arg)
+{
+#ifdef DEBUG
+	size_t i;
+
+	fprintf(f, " %s flag    enable trace flag (all", trace_arg);
+
+	for (i = 0; i < g_num_trace_flags; i++) {
+		fprintf(f, ", %s", g_trace_flags[i].name);
+	}
+
+	fprintf(f, ")\n");
+#else
+	fprintf(f, " %s flag    enable trace flag (not supported - must rebuild with CONFIG_DEBUG=y)\n",
+		trace_arg);
+#endif
+}