diff --git a/emr-extras/README.txt b/emr-extras/README.txt
new file mode 100644
index 0000000..2bf9f53
--- /dev/null
+++ b/emr-extras/README.txt
@@ -0,0 +1,3 @@
+Somewhat incomplete helper functions for running guineapig on the
+Amazon EC2 infrastructure.
+
diff --git a/mrs_test/README.txt b/mrs_test/README.txt
new file mode 100644
index 0000000..63b09ca
--- /dev/null
+++ b/mrs_test/README.txt
@@ -0,0 +1,2 @@
+Code for testing the mrs_gp.py subsystem.
+