+# There are two PCD PPIs as follows:\r
+# 1) PCD_PPI \r
+# It is EDKII implementation which support Dynamic/DynamicEx Pcds.\r
+# 2) EFI_PEI_PCD_PPI\r
+# It is defined by PI specification 1.2, Vol 3 which only support dynamicEx \r
+# type Pcd.\r
+# For dynamicEx type PCD, it is compatible between PCD_PPI and EFI_PEI_PCD_PPI.\r
+# This library instance uses the PCD_PPI to handle dynamic PCD request and use\r
+# EFI_PEI_PCD_PPI to handle dynamicEx type PCD.\r
+#\r
+# This library instance assume the PCD_PPI and EFI_PEI_PCD_PPI are both installed early.\r
+#\r