diff --git a/README.md b/README.md
index ff7535c..db3ea46 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,9 @@ For content that is added in later expansion that is provided for use in lower-l
 
 Options are provided to allow changes to experience based on preference. Please see config file.
 
+### Optional Data Files
+Some changes for Vanilla and TBC content require DBC modification. The .mpq file for the client and .dbc files for server can be found in the "optional" directory. These changes include Vanilla reagents such as Flint and Steel for campfires, Level 60 enchanting using Vanilla and not TBC ingredient, professional leveling adjustments, etc. These is all optional and the module will work without the patch, but these recipes will remain WotLK version.
+
 ## Thank You
 Special thanks to all contributors of the following projects which are make this module possible:
 * AzerothCore and TrinityCore, along with ancestors Mangos, etc.