diff --git a/README.md b/README.md
index 02cd7f0b..4872628c 100755
--- a/README.md
+++ b/README.md
@@ -488,7 +488,7 @@ supported python versions.
 
 Documentation is built using [Sphinx](http://www.sphinx-doc.org/) from [docstrings](https://www.python.org/dev/peps/pep-0257/)
 using a GitHub [action](https://github.com/BjornFJohansson/pydna/actions/workflows/publish-docs.yml).
-The [numpy](www.numpy.org) [docstring format](https://numpy.org/doc/stable/dev/howto-docs.html#docstring-intro) is used.
+The [numpy](https://www.numpy.org) [docstring format](https://numpy.org/doc/stable/dev/howto-docs.html#docstring-intro) is used.
 
 Below the commands to run a local sphinx server that auto-updated when files are changed.