diff --git a/README.md b/README.md
index 17e2591..54c4ac7 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,13 @@ the default one instead.
 Note: All of these can be used when specifying reforge-able items, such as
 "preset:weapon-smith:bow,preset:armor_smith:gold,PRESET:TOOL_SMITH,shield"
 
+The format of reforge-able items requires each preset/material to be separated by a comma. If specifying a preset
+instead of a material, start by typing "preset:". Then you can type WEAPON_SMITH, ARMOR_SMITH or TOOL_SMITH. If you
+want, you can add another colon and one of the filters supported by the preset. For example: "preset:WEAPON_SMITH:BOW"
+to make the blacksmith only repair bows. You can use the same preset several times with different filters. For
+example: "preset:ARMOR_SMITH:DIAMOND,preset:ARMOR_SMITH:NETHERITE" would allow the blacksmith to repair all diamond and
+netherite armor.
+
 All currently supported presets, and available filters for each preset:
 
 - WEAPON_SMITH: