diff --git a/rt-thread-version/rt-thread-standard/programming-manual/porting/porting.md b/rt-thread-version/rt-thread-standard/programming-manual/porting/porting.md
index 6adf15d5fbf1d24bf6ad75e48f90e8b224e121d3..29c9327b4742ddcef194bce96985525717d80aac 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/porting/porting.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/porting/porting.md
@@ -310,7 +310,7 @@ PendSV_Handler   PROC
     MOV     r1, #0x00
     STR     r1, [r0]
 
-    ; 检查 rt_thread_switch_interrupt_flag 变量
+    ; 检查 rt_interrupt_from_thread 变量是否为 0
     ; 如果为 0，就不进行 from 线程的上下文保存
     LDR     r0, =rt_interrupt_from_thread
     LDR     r1, [r0]