diff --git a/lib/serialize/parseFunction.js b/lib/serialize/parseFunction.js
index b64904a1..d3bfc7fd 100644
--- a/lib/serialize/parseFunction.js
+++ b/lib/serialize/parseFunction.js
@@ -839,8 +839,10 @@ function resolveFunctionInfo(
 	// Initializing properties of `internalVars` needs to happen before processing child functions,
 	// as external vars in child functions can become internal vars in this function.
 	// Store for later any which have no trails, as that indicates that the binding is accessed
-	// within a `with () {}` block, and mist not be renamed.
+	// within a `with () {}` block, and must not be renamed.
 	// TODO: This is hacky as hell. There must be a better way to do it.
+	// I also don't think it works properly.
+	// e.g. `() => { let x; return [x => x, () => { with ({}) return () => x; }]}`
 	// TODO: Check if internal vars are always created for all functions above where binding is.
 	// TODO: Can this logic be combined with logic that prevents functions names being changed?
 	const internalVarTrails = [],