diff --git a/doc/contributing/contributing-to-documentation.chapter.md b/doc/contributing/contributing-to-documentation.chapter.md
index 557473555f8a..7668629d4e26 100644
--- a/doc/contributing/contributing-to-documentation.chapter.md
+++ b/doc/contributing/contributing-to-documentation.chapter.md
@@ -25,6 +25,9 @@ As per [RFC 0072](https://github.com/NixOS/rfcs/pull/72), all new documentation
 
 Additional syntax extensions are available, all of which can be used in NixOS option documentation. The following extensions are currently used:
 
+- []{#ssec-contributing-markup-tables}
+  [GFM tables](https://github.github.com/gfm/#tables-extension-).
+
 - []{#ssec-contributing-markup-anchors}
   Explicitly defined **anchors** on headings, to allow linking to sections. These should be always used, to ensure the anchors can be linked even when the heading text changes, and to prevent conflicts between [automatically assigned identifiers](https://github.com/jgm/commonmark-hs/blob/master/commonmark-extensions/test/auto_identifiers.md).