[SOLVED] What is the name of this PDE?

[dwsmith]

\begin{align*}
\psi_t + \psi_{xxx} + f(\psi)\psi_x &= 0
\end{align*}

This equation leads to the nonlinear Shrodinger equation but does this equation have a name?

 

[Ackbach]

It's the Korteweg-de Vries equation.