diff --git a/README.rst b/README.rst
index ed2a222..2f52e32 100644
--- a/README.rst
+++ b/README.rst
@@ -16,6 +16,7 @@ install it along with the ReadTheDocs theme, run the following commands:
 
    pip install sphinx
    pip install sphinx-rtd-theme
+   pip install nbsphinx-link
 
 For a Linux system with `apt` (e.g. Ubuntu), you can do:
 
@@ -23,7 +24,10 @@ For a Linux system with `apt` (e.g. Ubuntu), you can do:
 
    apt-get install python3-sphinx python3-sphinx-rtd-theme
 
+   Note: The `nbsphinx-link` package is needed to process Python notebook examples 
+         but is not available via apt. It may be installed using pip:
 
+       pip install nbsphinx-link
 
 Compile the documentation
 -------------------------