diff --git a/docs/spec/openapi.yaml b/docs/spec/openapi.yaml
index 8775548..7380865 100644
--- a/docs/spec/openapi.yaml
+++ b/docs/spec/openapi.yaml
@@ -1694,7 +1694,7 @@ paths:
                 "200":
                     description: OK
                     content:
-                        application/json:
+                        application/octet-stream:
                             schema:
                                 type: string
             x-oaiMeta:
@@ -14273,4 +14273,4 @@ x-oaiMeta:
                 path: create
               - type: object
                 key: CreateCompletionResponse
-                path: object
+                path: object
\ No newline at end of file
diff --git a/docs/spec/sanitations.md b/docs/spec/sanitations.md
index e2439cc..dcac153 100644
--- a/docs/spec/sanitations.md
+++ b/docs/spec/sanitations.md
@@ -37,6 +37,13 @@ This document records the sanitation done on top of the official OpenAPI specifi
 
    - **Reasons**: The response does not include the code, message, and param, causing an error of missing required fields when converting.
 
+4. **Changed the response content type in `/files/{file_id}/content` endpoint**
+   - **Original**: The response content type of the `/files/{file_id}/content` endpoint was originally `application/json`.
+
+   - **Updated**: The content type has been changed to `application/octet-stream`.
+
+   - **Reasons**: The server's actual response content type was `application/octet-stream`.
+
 ## OpenAPI cli command
 
 The following command was used to generate the Ballerina client from the OpenAPI specification. The command should be executed from the repository root directory.
@@ -44,4 +51,4 @@ The following command was used to generate the Ballerina client from the OpenAPI
 ```bash
 bal openapi -i docs/spec/openapi.yaml --mode client --license docs/license.txt -o ballerina --tags 'Fine-tuning','Files','Models'
 ```
-Note: The license year is hardcoded to 2024, change if necessary.
+Note: The license year is hardcoded to 2024, change if necessary.
\ No newline at end of file