diff --git a/AGENTS.md b/AGENTS.md
index 48bd4a7..d244adb 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -127,6 +127,7 @@ cppcourse/
 - `DOS_Unix/`: platform Keyboard/Screen implementations shared by the GUI
   exercises. The DOS variants are Windows-specific; on Unix-like systems the
   curses variants are built instead (linked as the `dos_unix` library).
+- `Materials/`: supplementary course material PDFs.
 - Each exercise directory holds a `CMakeLists.txt` that defines its target via
   `cmat_add_exercise()` (see `cmat/CMakeLists.txt`). Exercises that need a
   missing dependency (e.g. Boost) are reported as not available at configure