doc/lua-filters: add note about extensions handling in read and write

1 files changed, 8 insertions, 0 deletions

diff --git a/doc/lua-filters.md b/doc/lua-filters.md
index 66a34c52a..7ecb98d26 100644
--- a/doc/lua-filters.md
+++ b/doc/lua-filters.md
@@ -3750,6 +3750,10 @@ all enabled extensions, or a table with extensions as keys and
 their activation status as values (`true` or `'enable'` to enable
 an extension, `false` or `'disable'` to disable it).
 
+Note: The extensions field in `reader_options` is ignored, as the
+function will always use the format extensions specified via the
+`format` parameter.
+
 Parameters:
 
 `markup`
@@ -3783,6 +3787,10 @@ Usage:
 
 Converts a document to the given target format.
 
+Note: The extensions field in `writer_options` is ignored, as the
+function will always use the format extensions specified via the
+`format` parameter.
+
 Parameters:
 
 `doc`