diff --git a/README.rst b/README.rst
index fa0cb09..4e88878 100644
--- a/README.rst
+++ b/README.rst
@@ -62,8 +62,8 @@ http://pymodes.readthedocs.io
 
 
 
-Install
--------
+Basic installation
+-------------------
 
 Installation examples::
 
@@ -76,6 +76,16 @@ Installation examples::
 
 Dependencies ``numpy``, ``pyzmq`` and ``pyrtlsdr`` are installed automatically during previous installations processes.
 
+Advanced installation (using c modules)
+------------------------------------------
+
+If you want to make use of the (faster) c module, install ``pyModeS`` as follows::
+
+  git clone https://github.com/junzis/pyModeS
+  cd pyModeS
+  make ext
+  make install
+
 
 View live traffic (modeslive)
 ----------------------------------------------------