diff --git a/Mod-Version-Data-Format.md b/Mod-Version-Data-Format.md
index 75ff0f8..0b274f6 100644
--- a/Mod-Version-Data-Format.md
+++ b/Mod-Version-Data-Format.md
@@ -105,7 +105,7 @@ Please be sure to use these commands prior to submitting a pull request for a ne
     4. Put the highest yielding recipe first.  Where all recipes are of equivalent complexity (e.g., 
        producing Rose Red from Poppies or Rose Bushes), place the recipe which produces the most first.
 
-* `input: <item name>, <item name>, ...` _(required)_
+* `input: <quantity>? <item name>, <quantity>? <item name>, ...` _(required)_
 
   Lists the items needed for the current recipe.  The names here must match *exactly* with the name of 
   the item listed else where in this (or another) file.  Failure to do so will cause it to show up in 
@@ -114,6 +114,9 @@ Please be sure to use these commands prior to submitting a pull request for a ne
   For recipes where an item is being smelted, the convention is to require a single "furnace fuel" item 
   to represent the fuel used in the furnace for that single item.
 
+  For recipes which require a stack of a certain item, enter the quantity required in front of that item.  If 
+  the quantity is left out, it will be assumed to be `1`.
+
   This command is required after each `recipe` command.
 
 * `onlyif: (not) <kind> <name>`