diff --git a/Changes.md b/Changes.md
index a73f449..586d8b3 100644
--- a/Changes.md
+++ b/Changes.md
@@ -2,6 +2,9 @@
 
 ## v0.13.2 (TBD)
 
+This release brings some new features and optimization for the game's file
+formats to improve performance and memory usage.
+
 Some new features:
 
 * **Doodads can be non-square!** You can now set a rectangular canvas size
@@ -12,6 +15,15 @@ Some new features:
   game's cheat codes by clicking on buttons instead. Enable it through the
   "Experimental" tab of the Settings, and the cheats menu can be opened from
   the Help menu bar during gameplay.
+* The game now supports **Signed Levels** and levelpacks which will enable the
+  free version of the game to play levels that have embedded doodads in them.
+  The idea is that the base game in the future may come with levelpacks that
+  use custom doodads (to tell a specific story) and these doodads may be so
+  specific and niche that they will ride with the levelpack instead of be
+  built-in to the game. To allow the free version of the game to play these
+  levels, the levelpacks will be signed. It also makes it possible for
+  promotional levelpacks or "free DLC" to be shipped separately and allow
+  free versions of the game to play them with their attached custom doodads.
 
 Other miscellaneous changes:
 
@@ -26,13 +38,23 @@ Other miscellaneous changes:
   help with touchscreen devices, where it is difficult to touch the
   properties button without accidentally dragging the actor elsewhere
   on your level as might happen with the Actor Tool!
+* Fix a bug wherein the gold "perfect run" icon next to the level timer
+  would sometimes not appear, especially after you had been cheating
+  before - if you restart the level with no cheats active the gold icon
+  should now always appear.
 * New cheat code: `tesla` will send a power signal to ALL actors on the
   current level in play mode - opening all electric doors and trapdoors.
   May cause fun chaos during gameplay. Probably not very useful.
 * Start distributing AppImage releases for GNU/Linux (64-bit and 32-bit)
 
-Some technical changes:
+Some technical changes related to file format optimization:
 
+* Palettes are now limited to 256 colors so that a palette index can fit
+  into a uint8 on disk.
+* Chunks in your level and doodad files are now encoded in a binary format
+  instead of JSON for a reduction in file size. The current (and only)
+  chunk implementation (the MapAccessor) encodes to a binary format involving
+  trios of varints (X, Y position + a Uvarint for palette index).
 * Chunk sizes in levels/doodads is now a uint8 type, meaning the maximum
   chunk size is 255x255 pixels. The game's default has always been 128x128
   but now there is a limit. This takes a step towards optimizing the game's