  We revise the symmetry analysis of a modified system of one-dimensional
shallow-water equations (MSWE) recently considered by Raja Sekhar and Sharma
[Commun. Nonlinear Sci. Numer. Simulat. 20 (2012) 630-636]. Only a finite
dimensional subalgebra of the maximal Lie invariance algebra of the MSWE, which
in fact is infinite dimensional, was found in the aforementioned paper. The
MSWE can be linearized using a hodograph transformation. An optimal list of
inequivalent one-dimensional subalgebras of the maximal Lie invariance algebra
is constructed and used for Lie reductions. Non-Lie solutions are found from
solutions of the linearized MSWE.
