1 files changed, 5 insertions, 1 deletions
diff --git a/MdePkg/Library/BasePciExpressLib/PciExpressLib.c b/MdePkg/Library/BasePciExpressLib/PciExpressLib.c
index 4d1dfb12a9..94fb0b2bee 100644
--- a/MdePkg/Library/BasePciExpressLib/PciExpressLib.c
+++ b/MdePkg/Library/BasePciExpressLib/PciExpressLib.c
@@ -37,9 +37,13 @@
   ASSERT (((A) & ~0xfffffff) == 0)
 
 /**
-  Register a PCI device so PCI configuration registers may be accessed after 
+  Registers a PCI device so PCI configuration registers may be accessed after 
   SetVirtualAddressMap().
   
+  Registers the PCI device specified by Address so all the PCI configuration 
+  registers associated with that PCI device may be accessed after SetVirtualAddressMap() 
+  is called.
+  
   If Address > 0x0FFFFFFF, then ASSERT().
 
   @param  Address Address that encodes the PCI Bus, Device, Function and