diff --git a/share/man/man9/style.9 b/share/man/man9/style.9
index d70868f9679..c3382d780ee 100644
--- a/share/man/man9/style.9
+++ b/share/man/man9/style.9
@@ -293,6 +293,9 @@ Enumeration values are all uppercase.
 enum enumtype { ONE, TWO } et;
 .Ed
 .Pp
+The use of internal_underscores in identifiers is preferred over
+camelCase or TitleCase.
+.Pp
 In declarations, do not put any whitespace between asterisks and
 adjacent tokens, except for tokens that are identifiers related to
 types.