diff --git a/MdePkg/Include/Library/GraphicsLib.h b/MdePkg/Include/Library/GraphicsLib.h
index 5a0d1857fb..31a391bd7e 100644
--- a/MdePkg/Include/Library/GraphicsLib.h
+++ b/MdePkg/Include/Library/GraphicsLib.h
@@ -183,7 +183,7 @@ LockKeyboards (
   @param[in]  Fmt          Print format sting. See definition of Print
   @param[in]  ...          Argumnet stream defined by Fmt string
 
-  @retval UINTN     Number of Characters printed
+  @return  Number of Characters printed.
 
 **/
 UINTN
diff --git a/MdePkg/Include/Library/PciSegmentLib.h b/MdePkg/Include/Library/PciSegmentLib.h
index 82635d633d..57f4c10a34 100644
--- a/MdePkg/Include/Library/PciSegmentLib.h
+++ b/MdePkg/Include/Library/PciSegmentLib.h
@@ -116,7 +116,7 @@ PciSegmentOr8 (
   If any reserved bits in Address are set, then ASSERT().
 
   @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.
-  @param  Andata    The value to AND with the PCI configuration register.
+  @param  AndData   The value to AND with the PCI configuration register.
 
   @return The value written to the PCI configuration register.
 
@@ -390,7 +390,7 @@ PciSegmentOr16 (
   If any reserved bits in Address are set, then ASSERT().
 
   @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.
-  @param  Andata    The value to AND with the PCI configuration register.
+  @param  AndData   The value to AND with the PCI configuration register.
 
   @return The value written to the PCI configuration register.
 
@@ -664,7 +664,7 @@ PciSegmentOr32 (
   If any reserved bits in Address are set, then ASSERT().
 
   @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.
-  @param  Andata    The value to AND with the PCI configuration register.
+  @param  AndData   The value to AND with the PCI configuration register.
 
   @return The value written to the PCI configuration register.
 
@@ -690,7 +690,7 @@ PciSegmentAnd32 (
   If any reserved bits in Address are set, then ASSERT().
 
   @param  Address   Address that encodes the PCI Segment, Bus, Device, Function, and Register.
-  @param  Andata    The value to AND with the PCI configuration register.
+  @param  AndData   The value to AND with the PCI configuration register.
   @param  OrData    The value to OR with the PCI configuration register.
 
   @return The value written to the PCI configuration register.