diff --git a/MdePkg/Library/BaseTimerLibLocalApic/BaseTimerLibLocalApic.msa b/MdePkg/Library/BaseTimerLibLocalApic/BaseTimerLibLocalApic.msa
index 23479e0b4f..1b086b2841 100644
--- a/MdePkg/Library/BaseTimerLibLocalApic/BaseTimerLibLocalApic.msa
+++ b/MdePkg/Library/BaseTimerLibLocalApic/BaseTimerLibLocalApic.msa
@@ -7,7 +7,9 @@
     <Version>1.0</Version>
     <Abstract>Component description file for Baser Timer Library</Abstract>
     <Description>Timer Library that only uses CPU resources to provide calibrated
-      delays on IA-32 and x64.</Description>
+      delays on IA-32 and x64. Note: Because CpuLocalApci timer could be programmed
+      by OS, it cannot be used by SMM drivers and runtime drivers, ACPI timer is
+      recommended for SMM drivers and runtime drivers.</Description>
     <Copyright>Copyright (c) 2006, Intel Corporation.</Copyright>
     <License>All rights reserved. This program and the accompanying materials
       are licensed and made available under the terms and conditions of the BSD License
@@ -23,7 +25,7 @@
     <OutputFileBasename>BaseTimerLibLocalApic</OutputFileBasename>
   </ModuleDefinitions>
   <LibraryClassDefinitions>
-    <LibraryClass Usage="ALWAYS_PRODUCED">
+    <LibraryClass Usage="ALWAYS_PRODUCED" SupModuleList="BASE SEC PEI_CORE PEIM DXE_CORE DXE_DRIVER UEFI_DRIVER UEFI_APPLICATION">
       <Keyword>TimerLib</Keyword>
     </LibraryClass>
     <LibraryClass Usage="ALWAYS_CONSUMED">