-= name/rule separator
-F walk forward, leave a trace
-A-Z rewrite operator
-+ turn left
-- turn right
-& pitch down
-^ pitch up
-\ roll left
-/ roll right
-| turn around 180 degrees
-[ save state to stack
-] restore state from stack
-{ first vertex of a filled polygon
-} last vertex of a filled polygon
-f one vertex of a filled polygon
-! decrease diameter of segment
-' increase color index
-, decrease color index
+F Walk forward, creating a segment
+A-Z Replacement rule
+A(0.33) Probability factor 0.33 for rule A
+= Rule assignment
++ Turn left
+- Turn right
+& Pitch down
+^ Pitch up
+\ Roll left
+/ Roll right
+| Turn around 180 degrees
+[ Save state to stack
+] Load state from stack
+{ Create a planar surface
+} Close a planar surface
+f One vertex in a planar surface, specified CCW
+! Decrement segment diameter
+' Increment current index to color table
+, Decrement current index to color table
+
+Example:
+
+F(0.33)=[+FL]F/[-FL]F!
+F(0.33)=F[&FL]F!
+F(0.34)=F/[-FL]&F!
+L={,-f++f-|-f++f-'}