diff --git a/src/ipc.c b/src/ipc.c
index 39cf217baa..c6a05e96a4 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -568,7 +568,7 @@ rt_err_t rt_mutex_detach(rt_mutex_t mutex)
     /* wakeup all suspend threads */
     rt_ipc_list_resume_all(&(mutex->parent.suspend_thread));
 
-    /* detach semaphore object */
+    /* detach mutex object */
     rt_object_detach(&(mutex->parent.parent));
 
     return RT_EOK;
@@ -633,7 +633,7 @@ rt_err_t rt_mutex_delete(rt_mutex_t mutex)
     /* wakeup all suspend threads */
     rt_ipc_list_resume_all(&(mutex->parent.suspend_thread));
 
-    /* delete semaphore object */
+    /* delete mutex object */
     rt_object_delete(&(mutex->parent.parent));
 
     return RT_EOK;