diff --git a/docs/source/config.rst b/docs/source/config.rst
index 35e83771..a28f0ec1 100644
--- a/docs/source/config.rst
+++ b/docs/source/config.rst
@@ -81,7 +81,7 @@ The environment config file consists of the following attributes:
         * ``combine_service_traffic`` - whether to consider bandwidth use separately for each network protocol or combine them into a single bandwidth reading (boolean)
         * ``quantisation_levels`` - how many discrete bandwidth usage levels to use for encoding. This can be an integer equal to or greater than 3.
 
-    The other configurable item is ``flatten`` which is false by default. When set to true, the observation space is flattened (turned into a 1-D vector). You should use this if your RL agent does not natively support the chosen shape of the observation space.
+    The other configurable item is ``flatten`` which is false by default. When set to true, the observation space is flattened (turned into a 1-D vector). You should use this if your RL agent does not natively support observation space types like ``gym.Spaces.Tuple``.
 
 * **num_episodes** [int]