window, and each starting position is pushed on the mark ring in its
respective buffer. Then point moves forward in each window, a character
at a time, until a mismatch between the two windows is reached. Then
-the command is finished. For more information about windows in Emacs,
-@ref{Windows}.
+the command is finished. Another invocation of this command with
+points on mismatching positions tries to skip non-matching text and
+move points forward, until a match between the two windows is reached.
+For more information about windows in Emacs, @ref{Windows}.
@vindex compare-ignore-case
@vindex compare-ignore-whitespace