diff --git a/share/man/man9/style.9 b/share/man/man9/style.9
--- a/share/man/man9/style.9
+++ b/share/man/man9/style.9
@@ -52,11 +52,17 @@
 
 /* Most single-line comments look like this. */
 
+// Although they may look like this.
+
 /*
  * Multi-line comments look like this.  Make them real sentences.  Fill
  * them so they look like real paragraphs.
  */
 .Ed
+C++ comments may be used in C and C++ code.
+Single-line comments should be consistently either C or C++ within a file.
+Multi-line comments should also be consistently either C or C++, but may differ
+from single-line comments.
 .Pp
 The copyright header should be a multi-line comment, with the first
 line of the comment having a dash after the star like so: