@vindex comment-end
When a comment command makes a new comment, it inserts the value of
@code{comment-start} to begin it. The value of @code{comment-end} is
-inserted after point, so that it will follow the text that you will insert
-into the comment. In C mode, @code{comment-start} has the value
-@w{@code{"/* "}} and @code{comment-end} has the value @w{@code{" */"}}.
+inserted after point, so that it will follow the text that you will
+insert into the comment. When @code{comment-end} is non-empty, it
+should start with a space. For example, in C mode,
+@code{comment-start} has the value @w{@code{"/* "}} and
+@code{comment-end} has the value @w{@code{" */"}}.
@vindex comment-padding
The variable @code{comment-padding} specifies how many spaces