-@code{tab-stop-list} controls these positions. The default value
-is @code{nil}, which means a tab stop every 8 columns. The value
-can also be a list of column numbers (in increasing order) at which to
-place tab stops. Emacs extends the list forever by repeating the
-difference between the last and next-to-last elements.
+@code{tab-stop-list} controls these positions. The default value is
+@code{nil}, which means a tab stop every 8 columns. The value can
+also be a list of zero-based column numbers (in increasing order) at
+which to place tab stops. Emacs extends the list forever by repeating
+the difference between the last and next-to-last elements.