diff --git a/secret_loader/__init__.py b/secret_loader/__init__.py
index 024e03a..a9f91db 100644
--- a/secret_loader/__init__.py
+++ b/secret_loader/__init__.py
@@ -1,3 +1,29 @@
+"""# Secret Loader System.
+
+System for loading secrets from a variety of sources.
+
+Usage:
+
+```python
+import secret_loader
+secrets = secret_loader.SecretLoader(env_key_prefix = 'MYAPP')
+
+db_username = secrets.load_or_fail('DATABASE_USERNAME')
+db_password = secrets.load_or_fail('DATABASE_PASSWORD')
+```
+
+Secret loading order:
+
+0. Hardcoded values. **This is purely for debugging and prototyping.**
+1. Files pointed to by environment variables. Docker friendly.
+2. Secrets folder. Also Docker friendly.
+3. [Pass: the standard unix password
+   manager](https://www.passwordstore.org/). Most suited for personal
+   usage; very unsuited for server environments. Requires `pass` installed
+   locally, and configuration of the `PASS_FOLDER` through one of the above
+   methods.
+4. Vault instance if configured. Suited for production environments.
+"""
 import logging
 import os
 import subprocess
@@ -19,23 +45,14 @@ ENV_KEY_VAULT_MOUNT_POINT = 'VAULT_MOUNT_POINT'
 ENV_KEY_PASS_FOLDER = 'PASS_FOLDER'
 
 class SecretLoader:
-    """System for loading secrets from a variety of sources.
+    """
+    Main entry point for loading secrets.
 
-    Priority order:
-
-    0. Hardcoded values. **This is purely for debugging and prototyping.**
-    1. Files pointed to by environment variables. Docker friendly.
-    2. Secrets folder. Also Docker friendly.
-    3. [Pass: the standard unix password
-       manager](https://www.passwordstore.org/). Most suited for personal
-       usage; very unsuited for server environments. Requires `pass` installed
-       locally, and configuration of the `PASS_FOLDER` through one of the above
-       methods.
-    4. Vault instance if configured. Suited for production environments.
+    See module documentation for usage.
     """
 
     def __init__(self, env_key_prefix: str, hardcoded: dict[str, str] | None = None):
-        assert not env_key_prefix.endswith('_')
+        assert not env_key_prefix.endswith('_'), 'Prefix must not end with _ (this will be added automatically)'
         self.env_key_prefix = env_key_prefix
         self.hardcoded: dict[str, str] = hardcoded if hardcoded is not None else {}
         self.pass_folder = None