diff --git a/doc/api.rst b/doc/api.rst
index e295f171..383e8977 100644
--- a/doc/api.rst
+++ b/doc/api.rst
@@ -350,8 +350,8 @@ allocator::
 
     custom_string vformat(custom_allocator alloc, fmt::string_view format_str,
                           fmt::format_args args) {
-      custom_memory_buffer buf(alloc);
-      fmt::vformat_to(buf, format_str, args);
+      auto buf = custom_memory_buffer(alloc);
+      fmt::vformat_to(std::back_inserter(buf), format_str, args);
       return custom_string(buf.data(), buf.size(), alloc);
     }
 
diff --git a/include/fmt/format.h b/include/fmt/format.h
index ebcd1cc2..b94d2adf 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -607,8 +607,8 @@ enum { inline_buffer_size = 500 };
 
   **Example**::
 
-     fmt::memory_buffer out;
-     format_to(out, "The answer is {}.", 42);
+     auto out = fmt::memory_buffer();
+     format_to(std::back_inserter(out), "The answer is {}.", 42);
 
   This will append the following output to the ``out`` object: