diff --git a/source/ranges.tex b/source/ranges.tex
index 5425e21825..2674998c06 100644
--- a/source/ranges.tex
+++ b/source/ranges.tex
@@ -15737,6 +15737,11 @@
   // \ref{coro.generator.class}, class template \tcode{generator}
   template<class Ref, class V = void, class Allocator = void>
     class generator;
+
+  namespace pmr {
+    template<class R, class V = void>
+      using generator = std::generator<R, V, polymorphic_allocator<>>;
+  }
 }
 \end{codeblock}