diff --git a/lib/wal/sources/Wal.hpp b/lib/wal/sources/Wal.hpp
index 50a87188..76b893e6 100644
--- a/lib/wal/sources/Wal.hpp
+++ b/lib/wal/sources/Wal.hpp
@@ -133,6 +133,7 @@ namespace WAL
 					this->_fixedUpdate();
 				}
 				this->_update(dtime);
+				// TODO delete entities scheduled for deletion.
 				callback(*this, state);
 			}
 		}