diff --git a/swank.R b/swank.R
index 59686299ec29b887d015e7d9c4fee76b8fe6ba04..99012ec57ec4bc7ed9b6d80010145476d40f108d 100644
--- a/swank.R
+++ b/swank.R
@@ -345,7 +345,7 @@ sendReplResultFunction <- sendReplResult
 }
 
 `swank:autodoc` <- function(slimeConnection, sldbState, rawForm, ...) {
-  "No Arglist Information"
+  list("No Arglist Information", TRUE)
 }
 
 `swank:operator-arglist` <- function(slimeConnection, sldbState, op, package) {