diff --git a/pyproject.toml b/pyproject.toml
index abdb41c..1ec18a8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,7 +49,7 @@ version-file = "_version.py"
 # TODO: add URLs before release
 [project.urls]
 "Homepage" = "https://github.com/hed-standard/ndx-hed"
-# "Documentation" = "https://package.readthedocs.io/"
+"Documentation" = "https://https://www.hed-resources.org/en/latest/HedAnnotationInNWB.html"
 "Bug Tracker" = "https://github.com/hed-standard/ndx-hed/issues"
 "Discussions" = "https://github.com/hed-standard/ndx-hed/discussions"
 "Changelog" = "https://github.com/hed-standard/ndx-hed/CHANGELOG.md"