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-rw-r--r--doc/lua-filters.md4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/lua-filters.md b/doc/lua-filters.md
index d17c44adf..e1007f452 100644
--- a/doc/lua-filters.md
+++ b/doc/lua-filters.md
@@ -1133,7 +1133,9 @@ storage. The "media bag" is used when pandoc is called with the
[`fetch (source, base_url)`]{#mediabag-fetch}
: Fetches the given source and inserts it into the media bag
- using a SHA1 hash of the content as filename.
+ using a SHA1 hash of the content as filename. Returns two
+ values: the filename (based on SHA1 hash) and the mime
+ type (or an empty string).
Usage: