diff --git a/README.md b/README.md
index eedad9f..12a2a4c 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@
 
 - The directory for built programs is specified with the `COMPILED_DIR` environment variable, falling back to `/compiled`
   - Built programs should be `.tar.zst` files placed in `$COMPILED_DIR/[package name]/`
+    - The archives should *not* contain a parent directory.
 - Programs should be built on Debian, unless there's a specific reason not to.
 - There should be a `build` branch for building the program.
 - Versions