diff --git a/.gitmodules b/.gitmodules
index b31ca17..e021a1e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "agbplay"]
 	path = agbplay
-	url = https://github.com/ipatix/agbplay
+	url = https://github.com/ahigerd/agbplay
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9689ace
--- /dev/null
+++ b/README.md
@@ -0,0 +1,60 @@
+# agbplay-gui
+
+**agbplay-gui** is a music player for Game Boy Advance ROMs that use the MusicPlayer2000
+(mp2k/m4a/"Sappy") sound engine. It is based on [agbplay](https://github.com/ipatix/agbplay)
+by ipatix.
+
+![agbplay-gui screenshot](screenshot.png)
+
+## Building
+
+agbplay-gui depends on the following libraries:
+
+* Qt 5
+* PortAudio
+
+A build script is provided for compiling on Windows using MSYS2. This script will download
+and build the required dependencies automatically. This script also supports cross
+compiling agbplay-gui from a non-Windows system with MinGW.
+
+First ensure that the agbplay submodule is checked out and up to date:
+
+* `git submodule update --init --recursive`
+
+To build on Windows using the automatic build script:
+
+* `make -C windows`
+
+To cross-compile a 32-bit binary using MinGW:
+
+* `make -C windows CROSS=mingw32`
+
+To cross-compile a 64-bit binary using MinGW:
+
+* `make -C windows CROSS=mingw64`
+
+To build using locally-installed libraries:
+
+* `qmake`
+* `make`
+
+## License
+
+**agbplay-gui** is created by Adam Higerd. It is derived from agbplay by
+ipatix. Both agbplay and agbplay-gui are distributed under the terms of
+the LGPLv3.
+
+*This program is free software: you can redistribute it and/or modify it
+under the terms of the GNU Lesser General Public License as published by the
+Free Software Foundation, either version 3 of the License, or (at your
+option) any later version.*
+
+*This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+License for more details.*
+
+*For more information about the GNU Lesser General Public License, see
+[https://www.gnu.org/licenses](https://www.gnu.org/licenses).*
+
+agbplay source code: [https://github.com/ipatix/agbplay](https://github.com/ipatix/agbplay)
diff --git a/resources/about.html b/resources/about.html
index 7a0bfb6..2af3e94 100644
--- a/resources/about.html
+++ b/resources/about.html
@@ -5,22 +5,22 @@
 <p>
   <b>agbplay-gui</b> is created by Adam Higerd. It is derived from agbplay by
   ipatix. Both agbplay and agbplay-gui are distributed under the terms of
-  the GPLv3.
+  the LGPLv3.
 </p>
 <p>
   <i>This program is free software: you can redistribute it and/or modify it
-  under the terms of the GNU General Public License as published by the
+  under the terms of the GNU Lesser General Public License as published by the
   Free Software Foundation, either version 3 of the License, or (at your
   option) any later version.</i>
 </p>
 <p>
   <i>This program is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-  Public License for more details.</i>
+  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+  License for more details.</i>
 </p>
 <p>
-  <i>For more information about the GNU General Public License, see
+  <i>For more information about the GNU Lesser General Public License, see
   <a href='https://www.gnu.org/licenses'>https://www.gnu.org/licenses</a>.</i>
 </p>
 <p>
diff --git a/screenshot.png b/screenshot.png
new file mode 100644
index 0000000..566bde3
Binary files /dev/null and b/screenshot.png differ