diff --git a/README.md b/README.md
index b97a94f..17dda8a 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,15 @@ Things is a collection of random trinkets, items and features that I feel enhanc
 *Enchanted Wax Gland* which lets you travel very quickly in water, the *Displacement Tome* which is essentially a Warp Book remake, the *Bater Wucket* which is an
 infinite Water Bucket and many more
 
+## Tags
+
+These item tags are useful for server owners, modpack developers, or mod developers to configure Things further.
+
+- `things:hardening_catalyst_blacklist`: prevents the item from being used with a Hardening Catalyst to make it unbreakable 
+- `things:agglomeration_blacklist`: prevents the item from being crafted with an Agglomeration
+- `things:displacement_tome_fuels`: decides what items can be used to charge a Displacement Tome
+- `things:enchantable/retribution`: decides what items can be enchanted with Retribution
+
 ## Credits
  - **Pois1x** for making the textures
  - **naschhorn** for helping with the Almanac
diff --git a/src/main/resources/data/things/tags/item/hardening_catalyst_blacklist.json b/src/main/resources/data/things/tags/item/hardening_catalyst_blacklist.json
new file mode 100644
index 0000000..600cac5
--- /dev/null
+++ b/src/main/resources/data/things/tags/item/hardening_catalyst_blacklist.json
@@ -0,0 +1,9 @@
+{
+  "replace": false,
+  "values": [
+    {
+      "required": false,
+      "id": "bewitchment:death_protection_poppet"
+    }
+  ]
+}
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