Lua: add fields `pandoc.readers` and `pandoc.writers`. (#8177)

The set of supported input and output formats is made available to Lua
users.

1 files changed, 13 insertions, 1 deletions

diff --git a/doc/lua-filters.md b/doc/lua-filters.md
index 6a302622d..88bcf7043 100644
--- a/doc/lua-filters.md
+++ b/doc/lua-filters.md
@@ -2437,10 +2437,22 @@ indexing rules.
 
 # Module pandoc
 
-Lua functions for pandoc scripts; includes constructors for
+Fields and functions for pandoc scripts; includes constructors for
 document tree elements, functions to parse text in a given
 format, and functions to filter and modify a subtree.
 
+## Static Fields {#pandoc.fields}
+
+### readers {#pandoc.readers}
+
+Set of formats that pandoc can parse. All keys in this table can
+be used as the `format` value in `pandoc.read`.
+
+### writers {#pandoc.writers}
+
+Set of formats that pandoc can generate. All keys in this table
+can be used as the `format` value in `pandoc.write`.
+
 ## Pandoc
 
 ### `Pandoc (blocks[, meta])` {#pandoc.pandoc}