diff --git a/collects/scribblings/reference/contracts.scrbl b/collects/scribblings/reference/contracts.scrbl
index 96e9a76faa..73d7f441c3 100644
--- a/collects/scribblings/reference/contracts.scrbl
+++ b/collects/scribblings/reference/contracts.scrbl
@@ -1361,7 +1361,7 @@ name @scheme[sexp-name] when signaling a contract violation.}
 
 @defparam[current-blame-format
           proc 
-          (-> blame? any/c string?)]{
+          (-> blame? any/c string? string?)]{
 
 This is a parameter that is used when constructing a
 contract violation error. Its value is procedure that