Clarify comment

src/abstract/edwards.ts

@@ -171,7 +171,8 @@ export function twistedEdwards(curveDef: CurveType): CurveFn {
       this._WINDOW_SIZE = windowSize;
       pointPrecomputes.delete(this);
     }
-    // fromHex and other functions returns valid point, but if point is created by user (fromAffine), it can be off curve
+    // Not required for fromHex(), which always creates valid points.
+    // Could be useful for fromAffine().
     assertValidity(): void {
       const { a, d } = CURVE;
       if (this.is0()) throw new Error('bad point: ZERO'); // TODO: optimize, with vars below?

src/abstract/weierstrass.ts

@@ -241,6 +241,8 @@ export function weierstrassPoints<T>(opts: CurvePointsType<T>) {
       if (pz == null || !Fp.isValid(pz)) throw new Error('z required');
     }
 
+    // Does not validate if the point is on-curve.
+    // Use fromHex instead, or call assertValidity() later.
     static fromAffine(p: AffinePoint<T>): Point {
       const { x, y } = p || {};
       if (!p || !Fp.isValid(x) || !Fp.isValid(y)) throw new Error('invalid affine point');