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-rw-r--r--guides/source/active_storage_overview.md11
1 files changed, 6 insertions, 5 deletions
diff --git a/guides/source/active_storage_overview.md b/guides/source/active_storage_overview.md
index cb9acdadcf..e7a94fc510 100644
--- a/guides/source/active_storage_overview.md
+++ b/guides/source/active_storage_overview.md
@@ -446,11 +446,12 @@ the box, Active Storage supports previewing videos and PDF documents.
</ul>
```
-WARNING: Extracting previews requires third-party applications, `ffmpeg` for
-video and `mutool` for PDFs. These libraries are not provided by Rails. You must
-install them yourself to use the built-in previewers. Before you install and use
-third-party software, make sure you understand the licensing implications of
-doing so.
+WARNING: Extracting previews requires third-party applications, `FFmpeg` for
+video and `muPDF` for PDFs, and on macOS also `XQuartz` and `Poppler`.
+These libraries are not provided by Rails. You must install them yourself to
+use the built-in previewers. Before you install and use third-party software,
+make sure you understand the licensing implications of doing so.
+
Direct Uploads
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