diff --git a/rtos-docs/threadx/chapter4.md b/rtos-docs/threadx/chapter4.md
index fb83247..d128b00 100644
--- a/rtos-docs/threadx/chapter4.md
+++ b/rtos-docs/threadx/chapter4.md
@@ -1379,7 +1379,7 @@ valid. */
 - tx_event_flags_set
 - tx_event_flags_set_notify
 
-### tx_event_flags_performance_info_get
+## tx_event_flags_performance_info_get
 
 Get event flags group performance information