  Feedback holds a pivotal role in practical communication schemes, even though
it does not enhance channel capacity. Its main attribute includes adaptability
in transmission that allows for a higher rate of convergence of the error
probability to zero with respect to blocklength. Motivated by this fact, we
present a non-asymptotic achievability bound for variable-length coding with
stop-feedback. Specifically, a general achievability bound is derived, that
employs a random coding ensemble in combination with minimum distance decoding.
The general bound is particularized for the Gaussian channel. Numerical
evaluation of the bound confirms the significant value of feedback compared to
transmission with fixed blocklength coding and without feedback.
