diff --git a/README.md b/README.md
index 24e69d5..ed9bc04 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,46 @@
-# Secret Loader
+# Secret Loader System.
 
-Python library for standardized and flexible loading of secrets, like passwords, etc.
+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, prototyping, and for
+   configuring below options.**
+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_STORE_SUBFOLDER` through one of the above
+   methods.
+4. Vault instance if configured. Suited for production environments.
+
+## TODO
+
+- [ ] Avoid leakage to swap files.
+    * Possibly Mlock? [Does not seem to work](https://stackoverflow.com/questions/29524020/prevent-ram-from-paging-to-swap-area-mlock)
+    * Alternatively use [mmap](https://docs.python.org/3/library/mmap.html) and [memoryview](https://stackoverflow.com/questions/18655648/what-exactly-is-the-point-of-memoryview-in-python)?§
+- [ ] Wrap secrets in intelligent strings:
+    * Instead of returning None on unloaded, return UnknownSecret, that produce
+      error when formatted.
+    * `repr(secret)` should not include contents, but only the secret and how
+      it was loaded.
+    * Methods on `Secret` should be kept minimal.
+- [ ] Vault:
+  * [ ] Ensure vault code path works.
+  * [ ] Document usage and requirements.
+
+## License
+
+Copyright 2024 Jon Michael Aanes.
+All rights reserved.
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..302328f
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+frozendict
diff --git a/requirements_test.txt b/requirements_test.txt
new file mode 100644
index 0000000..e079f8a
--- /dev/null
+++ b/requirements_test.txt
@@ -0,0 +1 @@
+pytest
diff --git a/setup.py b/setup.py
index 7171814..1ec7bae 100644
--- a/setup.py
+++ b/setup.py
@@ -48,9 +48,11 @@ def determine_short_description(readme: str) -> str:
 
 
 REQUIREMENTS_MAIN = """
+frozendict
 """
 
 REQUIREMENTS_TEST = """
+pytest
 """