diff --git a/docs/datasets/data-anonymization/index.md b/docs/datasets/data-anonymization/index.md
index 730b0fe7b97..5e0f1cdf42d 100644
--- a/docs/datasets/data-anonymization/index.md
+++ b/docs/datasets/data-anonymization/index.md
@@ -164,6 +164,16 @@ blur:
 
 The tool provides two options to anonymize images in ROS 2 bag files.
 
+!!! warning
+
+    If your ROS 2 bag file includes custom message types from Autoware or any other packages, you should source the 
+    their workspaces before running the tool.
+
+    You can source Autoware workspace with the following command.
+    ```bash
+    source /path/to/your/workspace/install/setup.bash
+    ```
+
 ### Option 1: Anonymize with Unified Model
 
 You should provide a single rosbag and tool anonymize images in rosbag with a unified model. The model is a combination