diff --git a/README.mdown b/README.mdown
index 0780423..0e22da8 100644
--- a/README.mdown
+++ b/README.mdown
@@ -365,6 +365,9 @@ This guide does not address these special requirements.
 I leave it up to you to research your mycelium species.
 
 [Grain spawn](#grain-spawn) is a common source of nutrients and the most accessible source of grain spawn is wild bird seed.
+You should, however, provide mycelium a variety of grain spawn from generation to generation so the strain does not lose it's ability to digest different sources of nutrition.
+
+The general instructions are the same for most grain spawn.
 
 # Grain Spawn