Add CAVEATS section that mentions that this function does not look
in the file system.

man/zip_dir_add.mdoc

diff --git a/man/zip_dir_add.mdoc b/man/zip_dir_add.mdoc
index c583300..657dcd5 100644
--- a/man/zip_dir_add.mdoc
+++ b/man/zip_dir_add.mdoc
@@ -1,5 +1,5 @@
 .\" zip_dir_add.mdoc -- add directory to zip archive
-.\" Copyright (C) 2006-2012 Dieter Baron and Thomas Klausner
+.\" Copyright (C) 2006-2014 Dieter Baron and Thomas Klausner
 .\"
 .\" This file is part of libzip, a library to manipulate ZIP archives.
 .\" The authors can be contacted at <libzip@nih.at>
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd June 23, 2012
+.Dd December 4, 2014
 .Dt ZIP_DIR_ADD 3
 .Os
 .Sh NAME
@@ -100,3 +100,7 @@
 .An Dieter Baron Aq Mt dillo@nih.at
 and
 .An Thomas Klausner Aq Mt tk@giga.or.at
+.Sh CAVEATS
+.Fn zip_dir_add
+does not look in the file system, it just creates one entry in the
+archive for the provided name.