diff --git a/modules/io/doc/io.rst b/modules/io/doc/io.rst
index ea47d5d6783f567e1d385e56db0a02f255df45e1..1f97001cf35f461b18527ee99c446580e0d57b20 100644
--- a/modules/io/doc/io.rst
+++ b/modules/io/doc/io.rst
@@ -272,12 +272,12 @@ Saving Density Maps
 
   For a list of file formats supported by :func:`SaveImage`, see :doc:`image_formats`.
   
+  .. code-block:: python
 
-.. code-block:: python
-  # load density map
-  image=io.LoadImage('density_map.ccp4')
-  # save density map
-  io.SaveImage(image, 'new_map.map', CCP4())
+    # load density map
+    image=io.LoadImage('density_map.ccp4')
+    # save density map
+    io.SaveImage(image, 'new_map.map', CCP4())