diff --git a/todo.md b/todo.md
index aebaae3..2e28c8e 100644
--- a/todo.md
+++ b/todo.md
@@ -4,11 +4,7 @@ things to try:
 
 * patch the entire expanded-ram imul8xe on top of imul8 to avoid the 3-cycle thunk penalty :D
 
-* square-root special case of multiplication for zx*zx and zy*zy
-  * the hi1*hi2 and lo1*lo2 8-bit muls can be optimized into a 512-byte lookup table
-  * jamey on mastodon tried this but had some problems. see what happens on our version!
-
-* double-check rounding behavior is correct
+* optimize out a store/load with mul8_add16 and mul8_add24
 
 * try 3.13 fixed point instead of 4.12 for more precision
   * can we get away without the extra bit?