diff --git a/docs/API.md b/docs/API.md
new file mode 100644
index 00000000..f93391d9
--- /dev/null
+++ b/docs/API.md
@@ -0,0 +1,37 @@
+---
+gitea: none
+include_toc: true
+---
+
+# API
+In addition to Minecraft: Pi Edition's [builtin API](https://minecraft.wiki/w/Pi_Edition_protocol), MCPI-Reborn also implements the [RaspberryJuice API](https://github.com/zhuowei/RaspberryJuice). This page documents the API.
+
+The API operates over a TCP socket.
+
+Commands are formatted like `<command>(<args>)` and may return a response. The response `Fail\n` indicates an error.
+
+It is typically hosted on port `4711`, but this can be configured.
+
+## Compatibility Mode
+By default, MCPI-Reborn runs in a "compatibility mode." This makes it completely compatible with RaspberryJuice, but limits functionality.
+
+* **Bold** text only applies to the compatibility mode.
+* <u>Underlined</u> text only applies when it is disabled.
+* Text enclosed in curly braces (`{}`) is meant to be [Base64-URL](https://base64.guru/standards/base64url) encoded when the compatibility mode is disabled.
+
+## Commands
+
+* Arguments surrounded by square brackets (`[]`) are optional.
+* Lists are delimited by `|`. For instance: `A|B|C`.
+
+### Vanilla
+
+### RaspberryJuice
+
+### Reborn-Specific
+* `world.getSign(x,y,z)`
+  * Description: Retrieve the text of the given sign.
+  * Output: `{line_1}|{line_2}|{line_3}|{line_4}`
+* `entity.getType(id)`
+  * Description: Check the type of the given entity.
+  * Output: `entity_id`
\ No newline at end of file
diff --git a/docs/README.md b/docs/README.md
index 408cb1e2..eec2a524 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -5,4 +5,5 @@
 * [View Terminology](TERMINOLOGY.md)
 * [View In-Game Controls](CONTROLS.md)
 * [View Custom Skins](CUSTOM_SKINS.md)
+* [View API](API.md)
 * [View Changelog](CHANGELOG.md)