diff --git a/docs/intro_observationbuilder.rst b/docs/intro_observationbuilder.rst
index 0f80a5e856c6bfdde10ed3e470c566981f303b93..fd03e26424378448839c57faa14fe730e68698ff 100644
--- a/docs/intro_observationbuilder.rst
+++ b/docs/intro_observationbuilder.rst
@@ -351,7 +351,8 @@ Beyond the basic agent information we can also access more details about the age
 
 - Agent max speed :code:`agent.speed_data["speed"]` wich defines the traveling speed when the agent is moving.
 - Agent position fraction :code:``agent.speed_data["position_fraction"]` which is a number between 0 and 1 and indicates when the move to the next cell will occur. Each speed of an agent is 1 or a smaller fraction. At each :code:`env.step()` the agent moves at its fractional speed forwards and only changes to the next cell when the cumulated fractions are :code:`agent.speed_data["position_fraction"] >= 1.`
-
+- Agent can move at different speed which can be set up by modifying the agent.speed_data within the schedule_generator. For example refer this Link_
+.. _Link:https://gitlab.aicrowd.com/flatland/flatland/blob/master/flatland/envs/schedule_generators.py#L59
 **Agent malfunction information**
 
 Similar to the speed data you can also access individual data about the malfunctions of an agent. All data is available through :code:`agent.malfunction_data` with: