Single line comments are introduced by a pound character (#, sometimes called a hash, sharp, or number sign character). This character and all that follow it on a line comprise a comment, and are discarded by Maple.

If the pound character is enclosed within a pair of left single quotes (a symbol), double quotes (a string), or a multi-line comment, then it is not treated as the beginning of a comment.

If the final character of a comment line is a non-escaped backslash, the comment is continued on the next line.

Multi-line comments are enclosed in (* and *). Multi-line comments are not available in 2-D math.

Multi-line comments may be nested, making the useful for temporarily commenting out blocks of Maple source code that may already contain single or multi-line comments.

If (* appears within a single line comment, it does not begin a multi-line comment, just as # appearing in a multi-line comment does not begin a single line comment.

Maple procedures and modules may also contain a description clause, which is similar to a comment in that its purpose is documentation. However, unlike # comments, the description clause is retained by Maple when the procedure is compiled into Maple's internal form and will be displayed when the procedure is printed.

x; # A single-line comment.

$x$

p := proc(x) description "Descriptions are retained by Maple.";
    # Square x.
    x^2; # Comments are discarded by Maple.
end proc;

$p≔\mathbf{proc}\left(x\right)\mathbf{description}''Descriptions\; are\; retained\; by\; Maple.''\;x\^2\mathbf{end\; proc}$