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+---
+title: Adding messages
+weight: 140
+---
+
+In an AsyncAPI document, adding [messages](/docs/reference/specification/v3.0.0#messageObject) mainly means setting up channels and operations. This is key for explaining how data moves between your applications. However, sometimes you might just want to use the AsyncAPI document to describe the messages themselves, without anything else.
+
+## Add messages
+
+In an AsyncAPI document, you define message definitions under channels. However, the best practice is to first define these messages under the 'components' section as reusable definitions. That way, you can reference them easily from a channel.
+
+Here is a diagram showing some channel fields and the relation between channel messages and components messages:
+
+```mermaid
+graph LR
+  C[channels]
+  F[title]
+  I[address]
+  A[components]
+  B[messages]
+  D[messages]
+  C --> F
+  C --> I
+  C --> D
+  D --> |$ref| B
+  A --> B
+  
+  style C fill:#47BCEE,stroke:#000;
+  style D fill:#47BCEE,stroke:#000;
+```
+
+### Channels section
+
+Define the channels section in your AsyncAPI document, including the `messages` your channel accepts. For example:
+
+```yaml
+channels:
+  allCommentsLiked:
+    address: comment/liked
+    messages:
+      commentLiked:
+        description: Message that is being sent when a comment has been liked by someone.
+        payload:
+           type: object
+           title: commentLikedPayload
+           additionalProperties: false
+           properties:
+               commentId: 
+                 type: string
+                 description: Id of the comment that was liked
+    description: Notification channel for all the services that need to know comment is liked.
+```
+
+The above example presents an application that communicates over the `allCommentsLiked` channel, which only accepts one message called `commentLiked`.
+
+### `messages` section
+
+In your AsyncAPI document, create a `components.messages` section to define each message your application uses as a reusable message. When setting up multiple channels, you won't have to repeat the same message definitions. For example:
+
+```yaml
+components:
+  messages:
+    commentLiked:
+        description: Message that is being sent when a comment has been liked by someone.
+        payload:
+           type: object
+           title: commentLikedPayload
+           additionalProperties: false
+           properties:
+               commentId: 
+                 type: string
+                 description: Id of the comment that was liked
+```
+
+You can reuse messages using the [Reference Object](/docs/reference/specification/v3.0.0#referenceObject). For example:
+
+```yml
+    messages:
+      commentLiked:
+        $ref: '#/components/messages/commentLiked'
+```
+
+Here's the complete AsyncAPI document with channels reusing the same message:
+```yml
+asyncapi: 3.0.0
+info:
+  title: Example API
+  version: '1.0.0'
+channels:
+  allCommentsLiked:
+    address: comment/liked
+    messages:
+      commentLiked:
+        $ref: '#/components/messages/commentLikedUnliked'
+    description: Notification channel for all the services that need to know comment is liked.
+  allCommentUnliked:
+    address: comment/unliked
+    messages:
+      commentUnliked:
+        $ref: '#/components/messages/commentLikedUnliked'
+    description: Notification channel for all the services that need to know comment is liked.
+components:
+  messages:
+    commentLikedUnliked:
+        description: Message that is being sent when a comment has been liked or unliked by someone.
+        payload:
+           type: object
+           title: commentInfoPayload
+           additionalProperties: false
+           properties:
+               commentId: 
+                 type: string
+                 description: Id of the comment that was liked or unliked
+```
+
+### Identifier of the message
+
+The key name that represents a message in your AsyncAPI document must be interpreted as `messageId`. If your document defines channels, the message key defined in the channel is the `messageId`.
+
+```yaml
+channels:
+  allCommentsLiked:
+    address: comment/liked
+    messages:
+      commentLiked:
+        $ref: '#/components/messages/commentLikedUnliked'
+    description: Notification channel for all the services that need to know comment is liked.
+```
+
+The above example shows a `commentLiked` message under the `allCommentsLiked` channel. It references a reusable message definition from the `components` section represented by the `commentLikedUnliked` key. In this setup, the `commentLiked` key is the `messageId` and not `commentLikedUnliked`.
+
+### Messages under operations
+
+Operations specify which channels they interact with. If a channel has several messages, but your operation only involves one, indicate which specific message the operation uses. 
+
+```yaml
+channels:
+  allComments:
+    address: comments
+    messages:
+      commentLiked:
+        $ref: '#/components/messages/commentLikedMsg'
+      commentUnliked:
+        $ref: '#/components/messages/commentUnlikedMsg'
+    description: Notification channel for all the services that need to know comment is liked.
+operations:
+  onCommentLiked:
+    action: receive
+    channel:
+      $ref: '#/channels/allComments'
+    messages:
+      - $ref: '#/channels/allComments/messages/commentLiked'
+```
+
+The above example demonstrates how to specify the message for the `onCommentsLiked` operation received from the `allCommentLiked` channel. It's important to note that the message reference points to the channel, not the components section. That ensures accurate information about the `messageId`, which in this case is `commentLiked`, not `commentLikedMsg`.