message: Expand explanatory comment
diff: @@ -439,7 +439,9 @@ struct FuseFullyConnectedAndMul : public OpRewritePattern<TFL::MulOp> {
  if (fc_op.fused_activation_function() != "NONE") return failure();
  // Only fuse multiplier if all dimensions other than the depth dimension
  - // are equal to 1.
  + // are equal to 1 since otherwise
  + // `matmul(x, filter) * cst != matmul(x, filter * cst)`
  + // even if `filter` and `cst` are be broadcastable.
  auto shape = cst.getType().getShape();
  if (!IsDimensionsDegenerateExceptLastOne(shape)) return failure();
  