2 files changed, 19 insertions, 13 deletions
diff --git a/MdePkg/Library/PeiIoLibCpuIo/IoHighLevel.c b/MdePkg/Library/PeiIoLibCpuIo/IoHighLevel.c
index bbcc06751e..75dc1f8aa4 100644
--- a/MdePkg/Library/PeiIoLibCpuIo/IoHighLevel.c
+++ b/MdePkg/Library/PeiIoLibCpuIo/IoHighLevel.c
@@ -133,7 +133,7 @@ IoAndThenOr8 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..7.
 
-  @return The value read.
+  @return The value read from Port.
 
 **/
 UINT8
@@ -413,7 +413,7 @@ IoAndThenOr16 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..15.
 
-  @return The value read.
+  @return The value read from Port.
 
 **/
 UINT16
@@ -693,7 +693,7 @@ IoAndThenOr32 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..31.
 
-  @return The value read.
+  @return The value read from Port.
 
 **/
 UINT32
@@ -1536,7 +1536,7 @@ MmioAndThenOr16 (
   @param  EndBit    The ordinal of the most significant bit in the bit field.
                     Range 0..15.
 
-  @return The value read.
+  @return The value read from Address.
 
 **/
 UINT16
diff --git a/MdePkg/Library/PeiIoLibCpuIo/IoLib.c b/MdePkg/Library/PeiIoLibCpuIo/IoLib.c
index bc8319eb29..e3622e6329 100644
--- a/MdePkg/Library/PeiIoLibCpuIo/IoLib.c
+++ b/MdePkg/Library/PeiIoLibCpuIo/IoLib.c
@@ -31,7 +31,7 @@
 
   @param  Port  The I/O port to read.
 
-  @return The value read.
+  @return The value read from Port.
 
 **/
 UINT8
@@ -94,7 +94,7 @@ IoWrite8 (
 
   @param  Port  The I/O port to read.
 
-  @return The value read.
+  @return The value read from Port.
 
 **/
 UINT16
@@ -163,7 +163,7 @@ IoWrite16 (
 
   @param  Port  The I/O port to read.
 
-  @return The value read.
+  @return The value read from Port.
 
 **/
 UINT32
@@ -232,7 +232,7 @@ IoWrite32 (
 
   @param  Port  The I/O port to read.
 
-  @return The value read.
+  @return The value read from Port.
 
 **/
 UINT64
@@ -301,7 +301,7 @@ IoWrite64 (
 
   @param  Address The MMIO register to read.
 
-  @return The value read.
+  @return The value read from Port.
 
 **/
 UINT8
@@ -331,7 +331,8 @@ MmioRead8 (
 
   @param  Address The MMIO register to write.
   @param  Value   The value to write to the MMIO register.
-
+  
+  @return The Value written back to Mmio register.
 **/
 UINT8
 EFIAPI
@@ -362,7 +363,7 @@ MmioWrite8 (
 
   @param  Address The MMIO register to read.
 
-  @return The value read.
+  @return The value read from Address.
 
 **/
 UINT16
@@ -396,6 +397,8 @@ MmioRead16 (
 
   @param  Address The MMIO register to write.
   @param  Value   The value to write to the MMIO register.
+  
+  @return The Value written back to Mmio register
 
 **/
 UINT16
@@ -430,7 +433,7 @@ MmioWrite16 (
 
   @param  Address The MMIO register to read.
 
-  @return The value read.
+  @return The value read from Address.
 
 **/
 UINT32
@@ -464,6 +467,8 @@ MmioRead32 (
 
   @param  Address The MMIO register to write.
   @param  Value   The value to write to the MMIO register.
+  
+  @return The Value written back to Mmio register
 
 **/
 UINT32
@@ -498,7 +503,7 @@ MmioWrite32 (
 
   @param  Address The MMIO register to read.
 
-  @return The value read.
+  @return The value read from Address.
 
 **/
 UINT64
@@ -533,6 +538,7 @@ MmioRead64 (
   @param  Address The MMIO register to write.
   @param  Value   The value to write to the MMIO register.
 
+  @return The Value written back to Mmio register
 **/
 UINT64
 EFIAPI