diff --git a/README.md b/README.md
index 5ef7446..51bc053 100644
--- a/README.md
+++ b/README.md
@@ -162,6 +162,10 @@ supported request types, for example:
 
 The reply should look like garbled text in all these cases.
 
+#### Mac OS X
+On Mac OS X 10.6 and later, iodine supports the native utun devices built into
+the OS - use `-d utunX`.
+
 
 Operational info
 ----------------
diff --git a/man/iodine.8 b/man/iodine.8
index feb8283..c9072a5 100644
--- a/man/iodine.8
+++ b/man/iodine.8
@@ -118,7 +118,8 @@ Chroot to 'chrootdir' after setting up tunnel.
 .TP
 .B -d device
 Use the TUN device 'device' instead of the normal one, which is dnsX on Linux
-and otherwise tunX.
+and otherwise tunX. On Mac OS X 10.6, this can also be utunX, which will attempt
+to use an utun device built into the OS.
 .TP
 .B -P password
 Use 'password' to authenticate. If not used,