org-export-referenc: Document :filetags property in communication channel

diff --git a/dev/org-export-reference.org b/dev/org-export-reference.org
index 82a0efd..8a97b28 100644 (file)
--- a/dev/org-export-reference.org
+++ b/dev/org-export-reference.org
@@ -800,6 +800,13 @@ by the exporter.
    - category :: tree
    - type :: hash table
 
+** ~:filetags~
+
+   List of global tags for buffer.  Used by [[#get-tags][~org-export-get-tags~]] to
+   get tags with inheritance.
+   - category :: option
+   - type :: list of strings
+
 ** ~:footnote-definition-alist~
 
    /Alist/ between footnote labels and their definition, as parsed
@@ -1635,7 +1642,8 @@ by the exporter.
    :END:
 
    Return list of exportable tags attached to a given headline or
-   inlinetask element.
+   inlinetask element.  With an optional argument, tags are inherited
+   from parent headlines and ~FILETAGS~ keywords.
 
    In particular, it removes select tags and exclude tags. The
    function also accepts an arbitrary list of tags for further