-The immediate character is @samp{#} for Sun compatibility. The
-line-comment character is @samp{|} (unless the @samp{--bitwise-or}
-option is used). If a @samp{#} appears at the beginning of a line, it
-is treated as a comment unless it looks like @samp{# line file}, in
-which case it is treated normally.
+Line comments are introduced by the @samp{|} character appearing
+anywhere on a line, unless the @option{--bitwise-or} command line option
+has been specified.
+
+An asterisk (@samp{*}) as the first character on a line marks the
+start of a line comment as well.
+
+@cindex M680x0 immediate character
+@cindex immediate character, M680x0
+
+A hash character (@samp{#}) as the first character on a line also
+marks the start of a line comment, but in this case it could also be a
+logical line number directive (@pxref{Comments}) or a preprocessor
+control command (@pxref{Preprocessing}). If the hash character
+appears elsewhere on a line it is used to introduce an immediate
+value. (This is for compatibility with Sun's assembler).
+
+@cindex M680x0 line separator
+@cindex line separator, M680x0