Add [in,out] in the @param for PCD header and c file.

[mirror_edk2.git] / MdePkg / Include / Library / PcdLib.h

diff --git a/MdePkg/Include/Library/PcdLib.h b/MdePkg/Include/Library/PcdLib.h
index 4902d2b3de5e8eafe78b46eec312f440d9ffe4cd..a0201049a5b9f932dd006367886f2d955c2bda02 100644 (file)
--- a/MdePkg/Include/Library/PcdLib.h
+++ b/MdePkg/Include/Library/PcdLib.h
@@ -624,9 +624,17 @@ LibPcdSetExBool (
   If Guid is NULL, then the default token space is used. \r
   If NotificationFunction is NULL, then ASSERT().\r
 \r
+  This notification function serves two purposes. Firstly, it notifies the module which \r
+  did the registration that the value of this PCD token has been set. Secondly, \r
+  it provides a mechanism for the module which did the registration to intercept \r
+  the set operation and override the value been set if necessary. After the invocation \r
+  of the callback function, TokenData will be used by PCD service PEIM or driver to \r
+  modify the internal data in PCD database. \r
+\r
+\r
   @param[in]  CallBackGuid The PCD token GUID being set.\r
   @param[in]  CallBackToken The PCD token number being set.\r
-  @param[in]  TokenData A pointer to the token data being set.\r
+  @param[in, out]  TokenData A pointer to the token data being set.\r
   @param[in]  TokenDataSize The size, in bytes, of the data being set.\r
 \r
   @retval VOID\r