README.md in driving_physics-0.0.2.1 vs README.md in driving_physics-0.0.3.1

@@ -8,36 +8,39 @@
 
 ## Work In Progress
 
 This is very much a **Work In Progress**.  Implemented so far:
 
+### Library Features
+
+* Spinning: rotational inertia and friction / hysteresis
+* Tires: traction force via friction (static and kinetic) and the normal force
+* Vectors: 2D Vector forces and 3D Vector torques
+* Motor: torque curves, rotating mass with friction
+* Gearbox: gear ratios, final drive, rotating mass with friction
+* Powertrain: combines motor and gearbox
+* Car: 4 tires, powertrain, extra mass presents a load to the powertrain
+* Acceleration: via drive traction from "first principles"
+* Variable clutch and throttle
+* Engine braking
+* Power and Energy
+
 ### mruby Support
 
-This is big.  This library is primarily a Ruby library, intended for use with
-CRuby (MRI), JRuby, etc.  **mruby** is the redheaded stepchild, with severe
+This library is primarily a Ruby library, intended for use with CRuby (MRI),
+JRuby, etc.  **mruby** is the redheaded stepchild, with significant
 implications for a codebase that wants to support both sides.  Supporting
 mruby here meant:
 
-1. Editing the codebase (minimally) to remove *mruby-deadends*.
+1. Editing the codebase (minimally) to avoid and remove *mruby-deadends*.
 2. Creating `rake` tasks to process normal .rb files into *mruby-compatible*
    .rb files
 3. Assembling all needed library .rb files into a master .rb file
 4. Compiling the library to bytecode
 5. Executing a toplevel/main script against the library
 6. Optionally executing toplevel/main bytecode against the library
 
 See the main Rakefile near the top for mruby stuff.
-
-### Library Features
-
-* Spinning: rotational inertia and friction / hysteresis
-* Tires: traction force via friction (static and kinetic) and the normal force
-* Vectors: 2D Vector forces and 3D Vector torques
-* Motor: torque curves, rotating mass with friction
-* Gearbox: gear ratios, final drive, rotating mass with friction
-* Powertrain: combines motor and gearbox
-* Car: 4 tires, powertrain, extra mass presents a load to the powertrain
-* Acceleration: via drive traction from "first principles"
 
 ## Rationale
 
 This is a toy project intended to scratch a personal itch: I want to create
 an environment to play with performance objectives under reasonable real-world