diff --git a/README.md b/README.md
index 2f041c8..f32d124 100644
--- a/README.md
+++ b/README.md
@@ -8,10 +8,19 @@ This project is in a very early stage and will be both restructured and renamed.
 
 ## Quickstart
 
-to install the python and other developer requirements into a venv run:
+To install the python and other developer requirements into a venv run:
 
     make install
 
+### Configuration options
+
+There's a few env vars that can be used with this project:
+
+* `TEST_TARGET`: Set to `AWS_CLOUD` to use an externally-deployed instance when running tests.
+* `SNAPSHOT_LEGACY_REPORT`: By default set to `0`. Can be set to `1`. This enables the legacy reporting output style.
+* `SNAPSHOT_UDPATE`: By default set to `0`. Can be set to `1`. This enables updating the snapshot file rather than comparing with its contents.
+* `SNAPSHOT_RAW`: By default set to `0`. Can be set to `1`. This outputs an additional snapshot file which contains the untransformed values.
+
 ## Format code
 
 We use black and isort as code style tools.
@@ -23,4 +32,4 @@ To execute them, run:
 
 To build a wheel and source distribution, simply run
 
-    make dist
\ No newline at end of file
+    make dist