diff --git a/run.py b/run.py
index 6e9e963..a4eb067 100755
--- a/run.py
+++ b/run.py
@@ -30,6 +30,8 @@ def configure_logger():
 def get_env(name) -> str:
     env = FTEST_AUTH = os.environ.get(name)
     logger.info(f"Environment: {name}: {env}")
+    if env is None:
+        raise Exception(f"Please set environment variable {name}. See https://git.batsense.net/ForgeFlux/webfinger-test#environment-variables")
     return env