diff --git a/docs/filetypes.md b/docs/filetypes.md
index c7bbc54d..747c56ee 100644
--- a/docs/filetypes.md
+++ b/docs/filetypes.md
@@ -71,14 +71,14 @@ The filetype for a file can be overridden with `manage -> force filetype` in the
 ## Applications
 
 | Filetype | Extension | MIME type                                                                   | Thumbnails | Viewable in Hydrus | Notes                                                             |
-|----------|-----------|-----------------------------------------------------------------------------| :--------: | :----------------: | ----------------------------------------------------------------- |
+| -------- | --------- | --------------------------------------------------------------------------- | :--------: | :----------------: | ----------------------------------------------------------------- |
 | flash    | `.swf`    | `application/x-shockwave-flash`                                             |     ✅     |         ❌         |                                                                   |
 | pdf      | `.pdf`    | `application/pdf`                                                           |     ✅     |         ❌         | 300 DPI assumed for resolution. No thumbnails for encrypted PDFs. |
 | epub     | `.epub`   | `application/epub+zip`                                                      |     ❌     |         ❌         |                                                                   |
 | djvu     | `.djvu`   | `image/vnd.djvu`                                                            |     ❌     |         ❌         |                                                                   |
 | docx     | `.docx`   | `application/vnd.openxmlformats-officedocument.wordprocessingml.document`   |     ❌     |         ❌         |                                                                   |
 | xlsx     | `.xlsx`   | `application/vnd.openxmlformats-officedocument.spreadsheetml.sheet`         |     ❌     |         ❌         |                                                                   |
-| docx     | `.pptx`   | `application/vnd.openxmlformats-officedocument.presentationml.presentation` |     ❌     |         ❌         |                                                                   |
+| pptx     | `.pptx`   | `application/vnd.openxmlformats-officedocument.presentationml.presentation` |     ✅     |         ❌         | Thumbnail only if embedded in the document                        |
 | rtf      | `.rtf`    | `application/rtf`                                                           |     ❌     |         ❌         |                                                                   |