Index: style.9
===================================================================
RCS file: /home/ncvs/src/share/man/man9/style.9,v
retrieving revision 1.93
diff -u -r1.93 style.9
--- style.9	10 Sep 2002 14:48:38 -0000	1.93
+++ style.9	17 Oct 2002 16:40:05 -0000
@@ -180,6 +180,47 @@
 } while (0)
 .Ed
 .Pp
+When code blocks are conditionally defined using
+.Ic #ifdef
+or
+.Ic #if ,
+a comment may be added following the matching
+.Ic #endif
+or
+.Ic #else
+to permit the reader to easily discern where conditionally defined code
+regions end.
+This comment should be used only for (subjectively) long regions, regions
+greater than 20 lines, or where a series of nested
+.Ic #ifdef 's
+may be confusing to the reader.
+Exceptions may be made for cases where code is contionally undefined for
+the purposes of lint, even though the undefined region may be small.
+The comment shall be seperated from the
+.Ic #endif
+or
+.Ic #else
+by a single space.
+For short conditionally defined regions, a closing comment should not be
+used.
+.Bd -literal
+#ifdef KTRACE
+#include <sys/ktrace.h>
+#endif
+
+#ifdef COMPAT_43
+/* A long block here, or other conditional code. */
+#else /* COMPAT_43 */
+/* Or here. */
+#endif /* COMPAT_43 */
+
+#ifndef COMPAT_43
+/* Yet another long block here, or other conditional code. */
+#else /* !COMPAT_43 */
+/* Or here. */
+#endif /* !COMPAT_43*/
+.Ed
+.Pp
 Enumeration values are all uppercase.
 .Bd -literal
 enum enumtype { ONE, TWO } et;