diff --git a/OptionRomPkg/AtapiPassThruDxe/AtapiPassThru.h b/OptionRomPkg/AtapiPassThruDxe/AtapiPassThru.h
index 5a41a0acf8..78501f7f4a 100644
--- a/OptionRomPkg/AtapiPassThruDxe/AtapiPassThru.h
+++ b/OptionRomPkg/AtapiPassThruDxe/AtapiPassThru.h
@@ -336,7 +336,7 @@ AtapiScsiPassThruDriverBindingStop (
                                 languages specified in SupportedLanguages. The
                                 number of languages supported by a driver is up
                                 to the driver writer. Language is specified
-                                in RFC 3066 or ISO 639-2 language code format.
+                                in RFC 4646 or ISO 639-2 language code format.
 
   @param  DriverName[out]       A pointer to the Unicode string to return.
                                 This Unicode string is the name of the
@@ -401,7 +401,7 @@ AtapiScsiPassThruComponentNameGetDriverName (
                                 languages specified in SupportedLanguages. The
                                 number of languages supported by a driver is up
                                 to the driver writer. Language is specified in
-                                RFC 3066 or ISO 639-2 language code format.
+                                RFC 4646 or ISO 639-2 language code format.
 
   @param  ControllerName[out]   A pointer to the Unicode string to return.
                                 This Unicode string is the name of the
diff --git a/OptionRomPkg/AtapiPassThruDxe/ComponentName.c b/OptionRomPkg/AtapiPassThruDxe/ComponentName.c
index 2f04f0bf3b..5ec08989aa 100644
--- a/OptionRomPkg/AtapiPassThruDxe/ComponentName.c
+++ b/OptionRomPkg/AtapiPassThruDxe/ComponentName.c
@@ -57,7 +57,7 @@ GLOBAL_REMOVE_IF_UNREFERENCED EFI_UNICODE_STRING_TABLE mAtapiScsiPassThruDriverN
                                 languages specified in SupportedLanguages. The
                                 number of languages supported by a driver is up
                                 to the driver writer. Language is specified
-                                in RFC 3066 or ISO 639-2 language code format.
+                                in RFC 4646 or ISO 639-2 language code format.
 
   @param  DriverName[out]       A pointer to the Unicode string to return.
                                 This Unicode string is the name of the
@@ -130,7 +130,7 @@ AtapiScsiPassThruComponentNameGetDriverName (
                                 languages specified in SupportedLanguages. The
                                 number of languages supported by a driver is up
                                 to the driver writer. Language is specified in
-                                RFC 3066 or ISO 639-2 language code format.
+                                RFC 4646 or ISO 639-2 language code format.
 
   @param  ControllerName[out]   A pointer to the Unicode string to return.
                                 This Unicode string is the name of the
diff --git a/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430.h b/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430.h
index 8ff302ac2b..93abd523d2 100644
--- a/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430.h
+++ b/OptionRomPkg/CirrusLogic5430Dxe/CirrusLogic5430.h
@@ -249,7 +249,7 @@ CirrusLogic5430ControllerDriverStop (
                                 languages specified in SupportedLanguages. The
                                 number of languages supported by a driver is up
                                 to the driver writer. Language is specified
-                                in RFC 3066 or ISO 639-2 language code format.
+                                in RFC 4646 or ISO 639-2 language code format.
 
   @param  DriverName[out]       A pointer to the Unicode string to return.
                                 This Unicode string is the name of the
@@ -314,7 +314,7 @@ CirrusLogic5430ComponentNameGetDriverName (
                                 languages specified in SupportedLanguages. The
                                 number of languages supported by a driver is up
                                 to the driver writer. Language is specified in
-                                RFC 3066 or ISO 639-2 language code format.
+                                RFC 4646 or ISO 639-2 language code format.
 
   @param  ControllerName[out]   A pointer to the Unicode string to return.
                                 This Unicode string is the name of the
diff --git a/OptionRomPkg/CirrusLogic5430Dxe/ComponentName.c b/OptionRomPkg/CirrusLogic5430Dxe/ComponentName.c
index 1a98b3788c..3ab4e83c41 100644
--- a/OptionRomPkg/CirrusLogic5430Dxe/ComponentName.c
+++ b/OptionRomPkg/CirrusLogic5430Dxe/ComponentName.c
@@ -61,7 +61,7 @@ GLOBAL_REMOVE_IF_UNREFERENCED EFI_UNICODE_STRING_TABLE mCirrusLogic5430Controlle
                                 languages specified in SupportedLanguages. The
                                 number of languages supported by a driver is up
                                 to the driver writer. Language is specified
-                                in RFC 3066 or ISO 639-2 language code format.
+                                in RFC 4646 or ISO 639-2 language code format.
 
   @param  DriverName[out]       A pointer to the Unicode string to return.
                                 This Unicode string is the name of the
@@ -134,7 +134,7 @@ CirrusLogic5430ComponentNameGetDriverName (
                                 languages specified in SupportedLanguages. The
                                 number of languages supported by a driver is up
                                 to the driver writer. Language is specified in
-                                RFC 3066 or ISO 639-2 language code format.
+                                RFC 4646 or ISO 639-2 language code format.
 
   @param  ControllerName[out]   A pointer to the Unicode string to return.
                                 This Unicode string is the name of the