diff --git a/lib/pure/marshal.nim b/lib/pure/marshal.nim
index 9b6482c778..b90d2899c1 100644
--- a/lib/pure/marshal.nim
+++ b/lib/pure/marshal.nim
@@ -270,6 +270,7 @@ proc store*[T](s: Stream, data: T) =
 
 proc `$$`*[T](x: T): string =
   ## returns a string representation of `x`.
+  ##
   ## Note: to serialize `x` to JSON use $(%x) from the ``json`` module
   var stored = initIntSet()
   var d: T