diff --git a/arcade/pymunk_physics_engine.py b/arcade/pymunk_physics_engine.py
index 246474d06..b0fe03dac 100644
--- a/arcade/pymunk_physics_engine.py
+++ b/arcade/pymunk_physics_engine.py
@@ -70,21 +70,21 @@ def add_sprite(self,
                    ):
         """ Add a sprite to the physics engine.
 
-            :param sprite: The sprite to add
-            :param mass: The mass of the object. Defaults to 1
-            :param friction: The friction the object has. Defaults to 0.2
+            :param sprite: The sprite to add.
+            :param mass: The mass of the object. Defaults to 1.
+            :param friction: The friction the object has. Defaults to 0.2.
             :param elasticity: How bouncy this object is. 0 is no bounce. Values of 1.0 and higher may behave badly.
             :param moment_of_inertia: The moment of inertia, or force needed to change angular momentum. \
             Providing infinite makes this object stuck in its rotation.
             :param body_type: The type of the body. Defaults to Dynamic, meaning, the body can move, rotate etc. \
             Providing STATIC makes it fixed to the world.
-            :param damping: See class docs
-            :param gravity: See class docs
+            :param damping: See class docs.
+            :param gravity: See class docs.
             :param max_velocity: The maximum velocity of the object.
-            :param max_horizontal_velocity: maximum velocity on the x axis
-            :param max_vertical_velocity: maximum velocity on the y axis
-            :param radius:
-            :param collision_type:
+            :param max_horizontal_velocity: Maximum velocity on the x axis in pixels.
+            :param max_vertical_velocity: Maximum velocity on the y axis in pixels.
+            :param radius: Radius for the shape created for the sprite in pixels.
+            :param collision_type: Assign a name to the sprite, use this name when adding collision handler.
         """
 
         if damping is not None:
@@ -205,7 +205,7 @@ def add_sprite_list(self,
                         mass: float = 1,
                         friction: float = 0.2,
                         elasticity: Optional[float] = None,
-                        moment_of_intertia: Optional[float] = None,
+                        moment_of_inertia: Optional[float] = None,
                         body_type: int = DYNAMIC,
                         damping: Optional[float] = None,
                         collision_type: Optional[str] = None
@@ -217,7 +217,7 @@ def add_sprite_list(self,
                             mass=mass,
                             friction=friction,
                             elasticity=elasticity,
-                            moment_of_inertia=moment_of_intertia,
+                            moment_of_inertia=moment_of_inertia,
                             body_type=body_type,
                             damping=damping,
                             collision_type=collision_type)