diff --git a/libpurgeablemem/cpp/include/purgeable_mem_base.h b/libpurgeablemem/cpp/include/purgeable_mem_base.h
index 1567e85e2f6c72037211f9ced5298bd39ea42849..7ea386d0fe5d083088a233c895fe09879647a7f8 100644
--- a/libpurgeablemem/cpp/include/purgeable_mem_base.h
+++ b/libpurgeablemem/cpp/include/purgeable_mem_base.h
@@ -39,6 +39,15 @@ public:
      *          While return true if content recover success.
      * OS cannot reclaim the memory of the obj's content when this
      * function return true, until EndRead() is called.
+     *
+     * Attension: the return value must be recevied and handled,
+     *            since the visiting of this object with the failure result
+     *            will cause unsuspected result.
+     * For example:
+     *               if (BeginRead()) {
+     *                   // visit this object
+     *                   EndRead();
+     *               }
      */
     bool BeginRead();
 
@@ -50,13 +59,22 @@ public:
     void EndRead();
 
     /*
-     * BeginRead: begin read the PurgeableMem obj.
+     * BeginRead: begin write the PurgeableMem obj.
      * Return:  return true if the obj's content is present.
      *          If content is purged(no present), system will recover its data,
      *          return false if content is purged and recover failed.
      *          While return true if content recover success.
      * OS cannot reclaim the memory of the obj's content when this
-     * function return true, until EndRead() is called.
+     * function return true, until EndWrite() is called.
+     *
+     * Attension: the return value must be recevied and handled,
+     *            since the visiting of this object with the failure result
+     *            will cause unsuspected result.
+     * For example:
+     *               if (BeginWrite()) {
+     *                   // visit this object
+     *                   EndWrite();
+     *               }
      */
 
     bool BeginWrite();
diff --git a/libpurgeablemem/interfaces/kits/c/purgeable_memory.h b/libpurgeablemem/interfaces/kits/c/purgeable_memory.h
index a228044348e33e324aa8c5df8dbb9378534face3..6d87f517e461582397f9c5dfaddb6c73ec76920d 100644
--- a/libpurgeablemem/interfaces/kits/c/purgeable_memory.h
+++ b/libpurgeablemem/interfaces/kits/c/purgeable_memory.h
@@ -108,6 +108,15 @@ bool OH_PurgeableMemory_Destroy(OH_PurgeableMemory *purgObj);
  * OS cannot reclaim the memory of @purgObj's content when this
  * function return true, until PurgMemEndRead() is called.
  *
+ * Attension: the return value must be recevied and handled,
+ *            since the visiting of this object with the failure result
+ *            will cause unsuspected result.
+ * For example:
+ *               if (OH_PurgeableMemory_BeginRead()) {
+ *                   // visit this object
+ *                   OH_PurgeableMemory_EndRead();
+ *               }
+ *
  * @since 10
  * @version 1.0
  */
@@ -138,6 +147,15 @@ void OH_PurgeableMemory_EndRead(OH_PurgeableMemory *purgObj);
  * OS cannot reclaim the memory of @purgObj's content when this
  * function return true, until PurgMemEndWrite() is called.
  *
+ * Attension: the return value must be recevied and handled,
+ *            since the visiting of this object with the failure result
+ *            will cause unsuspected result.
+ * For example:
+ *               if (OH_PurgeableMemory_BeginWrite()) {
+ *                   // visit this object
+ *                   OH_PurgeableMemory_EndWrite();
+ *               }
+ *
  * @since 10
  * @version 1.0
  */