-These characters allow automated discovery of file type. They are
-interpreted as a the beginning of a comment by the TSDL metadata parser.
-The comment can be continued to contain extra commented characters
-before it is closed.
+It must be followed by a space, and the version of the specification
+followed by the CTF trace, e.g.:
+
+" 1.8"
+
+These characters allow automated discovery of file type and CTF
+specification version. They are interpreted as a the beginning of a
+comment by the TSDL metadata parser. The comment can be continued to
+contain extra commented characters before it is closed.