Updated description of ball angle feature in manual.

doc/manual.tex

@@ -283,9 +283,9 @@ features.
   Figure \ref{fig:playfieldCoords}.}
 \item{\textbf{Y position} - The agent’s y-position on the field. See
   Figure \ref{fig:playfieldCoords}.}
-\item{\textbf{Orientation} - The direction that the agent is facing.}
+\item{\textbf{Orientation} - The global direction that the agent is facing.}
 \item{\textbf{Ball Proximity} - Agent's proximity to the ball.}
-\item{\textbf{Ball Angle} - Angle to the ball.}
+\item{\textbf{Ball Angle} - The global angle to the ball. A relative angle to the ball can be determined by subtracting the agent's orientation (feature 2).}
 \item{\textbf{Able to Kick} - Boolean indicating if the agent can kick the ball.}
 \item{\textbf{Goal Center Proximity} - Agent's proximity to the center of the goal.}
 \item{\textbf{Goal Center Angle} - Angle from the agent to the center of the goal.}