diff --git a/include/foonathan/memory/memory_pool.hpp b/include/foonathan/memory/memory_pool.hpp
index d764365..a7e5961 100644
--- a/include/foonathan/memory/memory_pool.hpp
+++ b/include/foonathan/memory/memory_pool.hpp
@@ -222,6 +222,11 @@ namespace foonathan
                 return arena_.get_allocator();
             }
 
+             /// \returns If `ptr` is in memory owned by the underlying arena.
+             bool owns(const void* ptr) const noexcept
+             {
+		return arena_.owns(ptr);
+             }
         private:
             allocator_info info() const noexcept
             {