diff --git a/FatPkg/EnhancedFatDxe/UnicodeCollation.c b/FatPkg/EnhancedFatDxe/UnicodeCollation.c
index 4a849af2eb..9e5db7b967 100644
--- a/FatPkg/EnhancedFatDxe/UnicodeCollation.c
+++ b/FatPkg/EnhancedFatDxe/UnicodeCollation.c
@@ -162,6 +162,12 @@ InitializeUnicodeCollationSupportWithConfig (
 /**
   Initialize Unicode Collation support.
 
+  This function searches Initialized Unicode Collation support based on PCDs:
+  PcdUnicodeCollation2Support and PcdUnicodeCollationSupport.
+  It first tries to locate Unicode Collation 2 protocol and matches it with current
+  platform language code. If for any reason the first attempt fails, it then tries to
+  use Unicode Collation Protocol.
+
   @param  AgentHandle          The handle used to open Unicode Collation (2) protocol.
 
   @retval EFI_SUCCESS          The Unicode Collation (2) protocol has been successfully located.
@@ -177,10 +183,18 @@ InitializeUnicodeCollationSupport (
   EFI_STATUS       Status;
 
   Status = EFI_UNSUPPORTED;
+
+  //
+  // First try to use RFC 3066 Unicode Collation 2 Protocol.
+  //
   if (FeaturePcdGet (PcdUnicodeCollation2Support)) {
     Status = InitializeUnicodeCollationSupportWithConfig (AgentHandle, &mRfc3066Lang);
   }
 
+  //
+  // If the attempt to use Unicode Collation 2 Protocol fails, then we fall back
+  // on the ISO 639-2 Unicode Collation Protocol.
+  //
   if (FeaturePcdGet (PcdUnicodeCollationSupport) && EFI_ERROR (Status)) {
     Status = InitializeUnicodeCollationSupportWithConfig (AgentHandle, &mIso639Lang);
   }