diff --git a/README.md b/README.md
index 3da28a07ecc22d651c20967d043b9a27738abb2b..346b880968f242ee0160713e4db0984fec702733 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ SPDX-License-Identifier: CC0-1.0
 [![REUSE status](https://api.reuse.software/badge/git.secluded.site/sb-mcp)](https://api.reuse.software/info/git.secluded.site/sb-mcp)
 [![Liberapay donation status](https://img.shields.io/liberapay/receives/Amolith.svg?logo=liberapay)](https://liberapay.com/Amolith/)
 
-_A three-tool MCP server for [SilverBullet]_
+_Four-tool MCP server for [SilverBullet]_
 
 [SilverBullet]: https://silverbullet.md
 
@@ -37,11 +37,10 @@ treat your SilverBullet space as a first-class workspace.
 [Space Lua]: https://silverbullet.md/Space%20Lua
 [Model Context Protocol]: https://modelcontextprotocol.io
 
-Because I always want to know, the prose you'd be adding to your agent's context
-window if you attached this server is
+Because I always want to know, the prose your agent would receive if it
+calls the `usage` tool is
 
 - [internal/server/silverbullet.md](https://git.secluded.site/sb-mcp/blob/main/internal/server/silverbullet.md)
-- [internal/server/tools.go](https://git.secluded.site/sb-mcp/blob/main/internal/server/tools.go)
 
 ## Tools
 
@@ -50,6 +49,7 @@ window if you attached this server is
 | `execute_lua`  | Run a Space Lua script on the SilverBullet instance.                 |
 | `screenshot`   | Capture the current SilverBullet viewport as a PNG image.            |
 | `console_logs` | Retrieve recent console log entries from SilverBullet for debugging. |
+| `usage`        | Load the full SilverBullet usage guide (Space Lua syntax, APIs, gotchas). |
 
 ### `execute_lua` parameters