diff --git a/src/module.rs b/src/module.rs
index a8404c55..ef160b57 100644
--- a/src/module.rs
+++ b/src/module.rs
@@ -7,5 +7,6 @@ pub trait Module {
     fn name(self) -> String;
 
     fn execute(&self, &rt : Runtime) -> Option<Error>;
+    fn shutdown(&self, &rt : Runtime) -> Option<Error>;
 
 }