Added explanation regarding PPM not being designed to handle other me…

…ssage types to README

README.md

@@ -20,7 +20,7 @@ trajectories with individuals is the objective of this project.
 
 # The Operational Data Environment (ODE) Privacy Protection Module (PPM)
 
-The PPM operates on streams of raw BSMs generated by the ODE. It determines
+The PPM operates on streams of raw BSMs processed by the ODE. It determines
 whether individual BSMs should be retained or suppressed (deleted) based on the
 information in that BSM and auxiliary map information used to define a geofence.
 BSM geoposition (latitude and longitude) and speed are used to determine the
@@ -42,6 +42,8 @@ loitering locations can aid in learning the identity of the driver.
 ## Supported Message Types
 - Basic Safety Message (BSM)
 
+It should be noted that the PPM is not designed to handle other message types at this time. Future versions of the PPM may support additional message types.
+
 ## Table of Contents
 
 1. [Release Notes](#release-notes)