diff --git a/README.md b/README.md
index ad993f5..8dd0789 100644
--- a/README.md
+++ b/README.md
@@ -20,3 +20,14 @@ Create a build dir, run cmake, and then make to build.
 
 SFML should be installed on the system. imgui, and imgui-sfml are git submodules
 and should be initialized with `git submodule update --init --recursive`.
+
+# Legal stuff
+
+Uses [imgui](https://github.com/ocornut/imgui), which is licensed under the
+[MIT](https://choosealicense.com/licenses/mit/) license.
+
+Uses [imgui-sfml](https://github.com/eliasdaler/imgui-sfml), which is licensed
+under the [MIT](https://choosealicense.com/licenses/mit/) license.
+
+Uses [catch](https://github.com/catchorg/Catch2), which is licensed under the
+[Boost Software](https://choosealicense.com/licenses/bsl-1.0/) license.