diff --git a/README.md b/README.md
index ffaab44..1acf954 100644
--- a/README.md
+++ b/README.md
@@ -26,9 +26,13 @@ time, msd = md.correlation.shifted_correlation(
 
 ## Installation
 
+=== DEPRECATED: 2025-08-19 === 
 The package requires the Python package [pygmx](https://github.com/mdevaluate/pygmx),
 which handles reading of Gromacs file formats.
 Installation of pygmx is described in its own repository.
+=== DEPRECATED: 2025-08-19 === 
+
+The package requires the Python package [pygmx](https://github.com/mdevaluate/pygmx),
 
 The mdevaluate package itself is plain Python code and, hence, can be imported from its directory directly, 
 or may be installed via setuptools to the local Python environment by running