Update to 1.21.4: "Creating Your First Item"

develop/items/first-item.md

@@ -100,6 +100,15 @@
 
 @[code](@/reference/latest/src/main/resources/assets/fabric-docs-reference/models/item/suspicious_substance.json)
 
+But we're still missing a thing: the item still doesn't load?
+
+### Adding an Item Description {#adding-an-item-description}
+
+Since 1.21.4, Minecraft won't try to guess your item model's location anymore, and so, we need to provide an item description.
+
+Create the item description JSON in the `assets/<mod id here>/items`, with the same name as the item; `suspicious_substance.json`.
+@[code](@/reference/latest/src/main/resources/assets/fabric-docs-reference/items/suspicious_substance.json)
+
 ### Breaking Down the Model JSON {#breaking-down-the-model-json}
 
 - `parent`: This is the parent model that this model will inherit from. In this case, it's the `item/generated` model.
@@ -109,6 +118,11 @@
 
 There are alternatives, such as `item/handheld` which is used for items that are held in the player's hand, such as tools.
 
+### Breaking Down the Item Description JSON {#breaking-down-the-item-description-json}
+- `model`: This is the property that contains the reference to our model.
+  - `type`: This is the type of our model. For most items, this should be `minecraft:model`
+  - `model`: This is the model's identifier. It should have this form: `<mod id here>:item/<item name here>`
+
 Your item should now look like this in-game:
 
 ![Item with correct model](/assets/develop/items/first_item_2.png)

reference/1.20.4/src/main/resources/assets/fabric-docs-reference/items/suspicious_substance.json

@@ -0,0 +1,6 @@
+{
+  "model": {
+    "type": "minecraft:model",
+    "model": "mod_id:item/suspicious_substance"
+  }
+}