What are the syntax requirements for comments that use ellipsis?

In a recent homework assignment, I was using comments to explain what my regression lines meant when using the "lsline" command.

For example:

 % 
62   lsline % The regression line indicates that internet usage is relatively
63   ... steady across all incomes while slightly decreasing at larger
64   ... incomes.

This format would produce a "This statement is incomplete." error.

However, earlier in my code, if I started the comment on a brand new line, no errors would be produced.

For example:

 %
12   % Data was retrieved from the Princeton Survey Research Associates Pew
13   ... Internet and American Life Project dataset.

I fixed the issue by making a new comment for each line of the comment.

For example:

 %
62   lsline % The regression line indicates that internet usage is relatively
63          % steady across all incomes while slightly decreasing at larger
63          % incomes.

What are the syntax errors that makes these two formats different?

[per isakson]

ellipsis do not denote comments. Doc says:

    ...
    Continuation. Three or more periods at the end of a line continue the 
    current function on the next line. Three or more periods before the end 
    of a line cause the MATLAB® software to ignore the remaining text on the
    current line and continue the function on the next line. This effectively 
    makes a comment out of anything on the current line that follows the three
    periods. For an example, see Continue Long Statements on Multiple Lines.