diff --git a/readme.md b/readme.md
index f2f84bc..a69c627 100644
--- a/readme.md
+++ b/readme.md
@@ -19,7 +19,7 @@ Enjoy! I'll probably work on this off and on for the next few weeks until I've g
 
 The 16-bit signed integer multiplication seems to be working, though I need to double-check it some more. It takes two 16-bit inputs and emits one 32-bit output in the zero page, using the Atari OS ROM's floating point registers as workspaces. Inputs are clobbered.
 
-The main loop is a basic add-and-shift, using 16-bit adds which requires flipping the sign of negative inputs (otherwise you'd have to add all those sign-extension bits). Runs in 480-780 cycles depending on input.
+The main loop is a basic add-and-shift, using 16-bit adds which requires flipping the sign of negative inputs (otherwise you'd have to add all those sign-extension bits). Runs in 470-780 cycles depending on input.
 
 The mandelbrot loop is partly sketched out but I have future updates to make on that.