diff --git a/README.md b/README.md
index f43bc93..d8a7d49 100644
--- a/README.md
+++ b/README.md
@@ -11,8 +11,18 @@ You can make Cardie and its protocols with:
 `$ make`
 
 Cardie itself requires the `expat_devel` package, the XMPP protocol requires
-`gloox_devel`, and the (provisional) IRC protocol requires
-`libircclient_devel`. You can also build either independent of the other:
+`gloox_devel`, and the (provisional) IRC protocol requires `libircclient_devel`.
+The (unusable and experimental) libpurple add-on requires `libpurple_devel` and
+`glib2_devel`. You can also build either independent of the other:
 
 `$ make caya; make libs; make protocols`
 
+## License
+Cardie itself is under the MIT license, but licenses vary for the included
+libraries and add-ons.
+
+The `xmpp` and `purple` add-ons are under the GPLv2+, and `irc` the MIT license.
+
+`libsupport` is under the MIT license, though containing some PD code.
+`librunview` contains code from Vision, and is under the MPL.
+`libinterface` is under the MIT license.