diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b0d1049..6e5065f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -29,13 +29,13 @@ jobs:
         npm run build
         npm test
         npm run gh-pages
-    - name: Slack Notification
-      uses: rtCamp/action-slack-notify@v2.0.0
-      env:
-        SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
-        SLACK_USERNAME: "doc_bot"
-        SLACK_ICON_EMOJI: ":robot:"
-        SLACK_TITLE: "New production version of documentation deployed!" 	
+    #- name: Slack Notification
+    #  uses: rtCamp/action-slack-notify@v2.0.0
+    #  env:
+    #    SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+    #    SLACK_USERNAME: "doc_bot"
+    #    SLACK_ICON_EMOJI: ":robot:"
+    #    SLACK_TITLE: "New production version of documentation deployed!" 	
     # Runs a single command using the runners shell
     #- name: Run a one-line script
     #  run: echo Hello, world!
diff --git a/spec/openapi.yaml b/spec/openapi.yaml
index 6323542..9972db0 100644
--- a/spec/openapi.yaml
+++ b/spec/openapi.yaml
@@ -1014,6 +1014,30 @@ paths:
         sent as, ```SMS``` (text message), ```MMS``` (multimedia message)
           or ```TTS``` (text to speech). With ```TTS``` format, we will call the destination number and read out the
           message using a computer generated voice. Specifying a format is optional, by default ```SMS``` will be used.
+        
+        - ```source_number_type``` If a source number is specified, the type of
+        source number may also be
+          specified. This is recommended when using a source address type that is not an internationally
+          formatted number, available options are ```INTERNATIONAL```, ```ALPHANUMERIC``` or ```SHORTCODE```. Specifying a
+          source number type is only valid when the ```source_number``` parameter is specified and is optional.
+          If a source number is specified and no source number type is specified, the source number type will be
+          inferred from the source number, however this may be inaccurate.
+        
+        - ```source_number```[optional]  Specify a source number to be used.  Refer to the section below for more information on source numbers.  
+        ⚠️ The number or sender ID must be registered to your account (from 1-Mar-2024).
+        
+          #### Source number (sender ID)
+          
+          There are several options for the number or sender ID that will show as the source of an outbound message. Some things to note:
+            - If you do not specify a source number, the message will be sent with the default number for your account.
+              - The default may be a number you have purchased from us - such as a dedicated number, a 10-digit longcode or toll-free number (US/CA), or a shortcode. Log into the web portal to manage your numbers.
+              - If your account has multiple numbers, you can specify which source number to use in the request.
+              - If your account does not have a number, your message may be sent using our shared number pool (in certain countries only)
+            - `Alpha tag:` In some countries (AU, GB, some others), you may be able to send using an alpha tag - text that represents your brand of business.  Before using an alpha tag, you must register it in the Numbers section of the web portal.
+            - `Other numbers:` You may use numbers that you own as the source number, but you must register them in the Numbers section of the web portal to confirm  you have a right to use the number.
+          If you need to register a large number of source numbers/sender IDs, consider using our [Source Address API](https://messagemedia.github.io/documentation/#tag/Source-Address)
+          
+          ⚠️ If you specify a source_number that is not registered to your account, the message may fail to send, or may be sent with an alternative number.
 
         - ```media``` The media is used to specify a list of URLs of the media file(s) that you are trying to send. 
         Supported file formats include png, jpeg and gif. ```format``` parameter must be set to ```MMS``` for this to