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diff --git a/lib/pure/collections/intsets.nim b/lib/pure/collections/intsets.nim
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+#
+#
+#            Nim's Runtime Library
+#        (c) Copyright 2012 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Specialization of the generic `packedsets module <packedsets.html>`_
+## (see its documentation for more examples) for ordinal sparse sets.
+
+import std/private/since
+import std/packedsets
+export packedsets
+
+type
+  IntSet* = PackedSet[int]
+
+proc toIntSet*(x: openArray[int]): IntSet {.since: (1, 3), inline.} = toPackedSet[int](x)
+
+proc initIntSet*(): IntSet {.inline.} = initPackedSet[int]()
+