Small fixes 3

docs/content/Guides/ocr.mdx

@@ -71,6 +71,13 @@ there, point `OCR_ENGINE=deepseek` at a DeepSeek-OCR endpoint or install
 `PATH`, scanned pages fail with an install hint (text-layer documents are
 unaffected).
 
+<Callout type="warning" emoji="⚠️">
+**Upgrading:** earlier images always included tesseract. If your deployment
+runs `OCR_ENABLED=true` with the `tesseract` engine, add
+`INSTALL_TESSERACT=true` to `.env` before rebuilding, or OCR of scanned pages
+stops working after the rebuild.
+</Callout>
+
 ## Installing the docling engine
 
 docling is not part of the base install, and OCR does not need it (see