docs: clarify gotcha in recent change

user-guide/mkdocs.yml

@@ -111,7 +111,7 @@ nav:
   - Use Cases:
     - Overview: usecases/overview.md
     - Data Analytics:
-# the following have been moved to the user guide. we need to remove these files from the directory in use cases
+# the following have been moved to the user guide. we need to remove these files from the directory in use cases, but doing so would break `{% include-markdown '../usecases/haan/usecase` in `user-guide/docs/tools/visualization.md`
 #      - Basic Image Browsing and Mapping: usecases/haan/usecase.md
 #      - Grouping and Tagging Image Files: usecases/haan/usecase-2.md
       - Multi-Data Set Image Analysis in Taggit: usecases/haan/usecase-3.md