Update config.txt comments

 - Some of them were unclear or inaccurate.

README.md

@@ -6,12 +6,14 @@ graphics to draw 3D fractals.
 
 ![Example screenshot](./sample_screenshot.png)
 
+(It looks better in motion!)
+
 
 Compiling
 =========
 
 Building this requires `gcc` to be installed and available on your path, and
-for the GLFW to be installed.
+for GLFW to be installed.
 
 On Linux
 --------
@@ -135,10 +137,10 @@ Available Actions
 
 The following list of actions are supported:
 
- - `move_forward <distance>`: Moves the turtle forward, drawing a line, the
-   given distance. The distance is a floating-point number of units. Units are
-   not particularly relevant, because the resulting 3D rendering will be scaled
-   to fit in the viewport regardless.
+ - `move_forward <distance>`: Moves the turtle forward the given distance, and
+   draws the line segment along its path. The distance is a floating-point
+   number of units. Units are not particularly relevant, because the resulting
+   3D rendering will be scaled to fit in the viewport regardless.
 
  - `rotate <degrees>`: Rotates the turtle to its left by the given
    floating-point number of degrees.

config.txt

@@ -1,11 +1,14 @@
 init CP
 
-# The () around the pyramids make it easier for me to keep track of the
-# positions when moving between the 5 pyramids.
+# I use the () to revert the position back to the "current" pyramid's bottom
+# left, facing right, in preparation for drawing the next pyramid.
 
 # Replace one square pyramid with 5 pyramids, always ending at the bottom left
 # corner facing right.
 P ((CPN1PN-N2PN-N3P)UND4P)
+
+# N is used to move forward the width of a single pyramid. It doubles every
+# iteration, since every existing pyramid's width doubles at the same rate.
 N NN
 
 actions
@@ -54,14 +57,14 @@ U
 rotate 45
 pitch 45
 
-# Undo the "upwards rotation in preparation for drawing the upper pyramid.
+# Undo the "U" rotation in preparation for drawing the upper pyramid.
 D
 pitch -45
 rotate -45
 
 
 # P = draw a single square pyramid. Starts at the bottom left corner facing
-# right, and ending at the bottom right corner, facing right.
+# right, and ends at the same place.
 P
 
 # Keep track of our start position, we'll return here at the end.