diff --git a/car/util.py b/car/util.py
index 5282fd4..e45ab26 100644
--- a/car/util.py
+++ b/car/util.py
@@ -1,2 +1,19 @@
+"""Car simulation utilities module
+   ===============================
+"""
+
 def mpsToKmph(speed):
+    """Meter per second to kilometer per hour unit converter
+    
+    Parameters
+    ----------
+    speed : multiplicable (float, numpy.array etc.)
+        Speed in m/s
+
+    Returns
+    -------
+    as *speed*
+    Speed converted to km/h
+        
+    """
     return speed*3.6
\ No newline at end of file
diff --git a/docs/index.rst b/docs/index.rst
index e325ed6..9b48f37 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -9,6 +9,9 @@ Welcome to carSim's documentation!
 .. automodule:: car.motion
 	:members:
 
+.. automodule:: car.util
+    :members:
+
 .. toctree::
    :maxdepth: 2
    :caption: Contents: