diff --git a/docs/cli/index.md b/docs/cli/index.md
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+# Command Line Interface
+
+Different parts of AutoRA experiments can require very different computational resources. For instance:
+
+- The theorist and experimentalist might require training or use of neural networks, and benefit from high 
+  performance computing (HPC) resources for short bursts – minutes or hours.
+- The experiment runner might post an experiment using a service like "Prolific" and poll every few minutes for 
+  hours, days or week until the experimental data are gathered.
+
+Running the experiment runner with the same resources as the theorist and experimentalist in this case would be 
+wasteful, and may be prohibitively expensive.
+
+To solve this problem, AutoRA comes with a command line interface (CLI). This can be used with HPC schedulers like 
+[SLURM](https://slurm.schedmd.com/) to run different steps in the cycle with different resources.
+
+You can use the CLI if the following conditions are true:
+
+1. Every part of `s` can be successfully [pickled](https://docs.python.org/3/library/pickle.html).
+2. You can write each step of your experiment as a single importable function which operates on a state and returns 
+   a state:
+    ```python
+    from example.lib import initial_state, experimentalist, experiment_runner, theorist
+    s = initial_state()
+    for i in range(3):
+        s = experimentalist(s)
+        s = experiment_runner(s)
+        s = theorist(s)
+    ```
+
+Contents of this section:
+
+- ["Basic Usage"](./basic-usage): Basic usage of the CLI
+- ["Usage with Cylc workflow manager"](./cylc-pip): Example using the Cylc workflow manager (which 
+  handles cyclical processes)
+- ["Usage with Cylc workflow manager and Slurm"](./cylc-slurm-pip): Example using the Cylc 
+  workflow manager and the SLURM scheduler with different resources for each step in the cycle.    
diff --git a/mkdocs.yml b/mkdocs.yml
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+++ b/mkdocs.yml
@@ -30,6 +30,7 @@ nav:
 - Cycle:
   - Functional: 'cycle/Linear and Cyclical Workflows using Functions and States.ipynb'
 - "Command Line Interface":
+  - Home: "cli/index.md"
   - "Basic Usage": "cli/basic-usage/README.md"
   - "Using Cylc": "cli/cylc-pip/README.md"
   - "Using Cylc and Slurm": "cli/cylc-slurm-pip/README.md"