diff --git a/src/run.rs b/src/run.rs
index dc35e27..c55e785 100644
--- a/src/run.rs
+++ b/src/run.rs
@@ -91,7 +91,7 @@ pub fn run_callback(ast: &Seg, syms: &mut SymTable) ->  Result<Ctr, Traceback> {
             }
         } else {
             Err(start_trace(
-                ("<call script>", "binary called, unimplemented!")
+                ("<call script>", "expected a relish script with a .rls extension")
                     .into()))
         }
     } else {