diff --git a/doc/README.md b/doc/README.md
index 4ccfaf4f65..f94d2c4ee6 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -17,6 +17,8 @@ Python packages required to build the docs are listed in
 Before building the documentation locally, you need to set up a dedicated
 environment with the doc-specific dependencies.
 
+You will need the `gdal` library (e.g. Fedora `sudo dnf install -y gdal-*`)
+
 ```bash
 cd doc
 uv venv --python 3.9