diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # nestur
 
-This is an NES emulator and a work in progress. The CPU and PPU work, though there are still at least a couple bugs. I've mostly tested on Donkey Kong and Super Mario Bros. so far. There are plenty of full-featured emulators out there; this is primarily an educational project but I do want it to run well.
+This is an NES emulator and a work in progress. The CPU, PPU, and APU mostly work, though there are still at least a couple bugs. I've mostly tested on Donkey Kong and Super Mario Bros. so far. There are plenty of full-featured emulators out there; this is primarily an educational project but I do want it to run well.
 
 - One dependency (SDL)