diff --git a/doc/lua-filters.md b/doc/lua-filters.md
index 616c13cea..901fd6be8 100644
--- a/doc/lua-filters.md
+++ b/doc/lua-filters.md
@@ -887,7 +887,7 @@ MetaValue is expected. The types correspond to the following
 Haskell type constructors:
 
 - boolean → MetaBool
-- string → MetaString
+- string or number → MetaString
 - Inlines → MetaInlines
 - Blocks → MetaBlocks
 - List/integer indexed table → MetaList