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-rw-r--r--doc/lua-filters.md4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/lua-filters.md b/doc/lua-filters.md
index 5e43afb26..16f6bfd56 100644
--- a/doc/lua-filters.md
+++ b/doc/lua-filters.md
@@ -132,6 +132,10 @@ Elements without matching functions are left untouched.
See [module documentation](pandoc-module.html) for a list of pandoc
elements.
+The global `FORMAT` is set to the format of the pandoc writer
+being used (`html5`, `latex`, etc.), so the behavior of a filter
+can be made conditional on the eventual output format.
+
# Pandoc Module
The `pandoc` lua module is loaded into the filter's lua