diff --git a/todo.txt b/todo.txt
index ccdd91e..a273f0f 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,5 +1,3 @@
 1. Error-checking - invalid regex, Out-of-bounds stuff. Do more testing.
-2. More operators - numeric specifier, Escaped characters, anchors, word boundaries, Inverting match inside character class
-    a. Make the zero-length checking more rigorous - a? does not match empty string, even though it should.
-3. Add support for zero-length matches - see https://regex101.com/r/8Ec4ue/1
-4. Fix adding concatenation operators in shunting-yard function (very janky, compares against operators individually)
+2. More operators - numeric specifier, escaped characters
+3. Fix adding concatenation operators in shunting-yard function (very janky, compares against operators individually)