diff --git a/.gitignore b/.gitignore
index eb0b272..8b5dddb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 build/
 .direnv/
+.cache/
diff --git a/AGENTS.md b/AGENTS.md
index d599d89..75ea9ef 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -7,6 +7,7 @@
 - Build: `cmake --build build`
 - Release build: `cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Release`
 - Run: `./build/ghostling`
+- Clean: `cmake --build build --target clean`
 
 ## Code Conventions
 
diff --git a/README.md b/README.md
index 6521cfd..94514ac 100644
--- a/README.md
+++ b/README.md
@@ -134,6 +134,12 @@ After the initial configuration, you only need to run the build step:
 cmake --build build
 ```
 
+To clean up the build directory:
+
+```sh
+cmake --build build --target clean
+```
+
 ## FAQ
 
 ### Why Not Zig?