diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index 2ddeab4cd9..b4e099d43e 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -285,12 +285,36 @@
   # @ValidList   0x80000001 | 0
   gUefiCpuPkgTokenSpaceGuid.PcdCpuFeaturesSetting|{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}|VOID*|0x00000019
 
-  ## Contains the size of memory required when CPU processor trace is enabled.
+  ## Contains the size of memory required when CPU processor trace is enabled.<BR><BR>
+  #  Default value is 0x10 which disables the processor trace.<BR>
+  #  0x0  -  4K.<BR>
+  #  0x1  -  8K.<BR>
+  #  0x2  -  16K.<BR>
+  #  0x3  -  32K.<BR>
+  #  0x4  -  64K.<BR>
+  #  0x5  -  128K.<BR>
+  #  0x6  -  256K.<BR>
+  #  0x7  -  512K.<BR>
+  #  0x8  -  1M.<BR>
+  #  0x9  -  2M.<BR>
+  #  0xA  -  4M.<BR>
+  #  0xB  -  8M.<BR>
+  #  0xC  -  16M.<BR>
+  #  0xD  -  32M.<BR>
+  #  0xE  -  64M.<BR>
+  #  0xF  -  128M.<BR>
+  #  0x10 -  ProcTraceMemDisable.<BR>
   # @Prompt The memory size used for processor trace.
+  # @ValidRange  0x80000001 | 0 - 0x10
   gUefiCpuPkgTokenSpaceGuid.PcdCpuProcTraceMemSize|0x10|UINT32|0x60000012
 
-  ## Contains the processor trace output scheme when CPU processor trace is enabled.
+  ## Contains the processor trace output scheme when CPU processor trace is enabled.<BR><BR>
+  #  Default value is 2 which disables the processor trace.<BR>
+  #  0 - Single Range output scheme.<BR>
+  #  1 - ToPA(Table of physical address) scheme.<BR>
+  #  2 - Invalid scheme.<BR>
   # @Prompt The processor trace output scheme.
+  # @ValidRange  0x80000001 | 0 - 2
   gUefiCpuPkgTokenSpaceGuid.PcdCpuProcTraceOutputScheme|0x2|UINT8|0x60000015
 
 [UserExtensions.TianoCore."ExtraFiles"]