+@node PJ Syntax
+@section PJ Syntax
+@menu
+* PJ-Chars:: Special Characters
+@end menu
+
+@node PJ-Chars
+@subsection Special Characters
+
+@cindex line comment character, PJ
+@cindex PJ line comment character
+The presence of a @samp{!} or @samp{/} on a line indicates the start
+of a comment that extends to the end of the current line.
+
+If a @samp{#} appears as the first character of a line then the whole
+line is treated as a comment, but in this case the line could also be
+a logical line number directive (@pxref{Comments}) or a preprocessor
+control command (@pxref{Preprocessing}).