diff --git a/CHANGELOG.md b/CHANGELOG.md
index bcaeefdd..80d6f7e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@ Version 286:
 * Refactor multi_buffer
 * Refactor buffers_adapter
 * Refactor static_buffer
+* Refactor flat_buffer
 
 API Changes:
 
@@ -10,6 +11,7 @@ API Changes:
 * buffers_adaptor::mutable_data_type is deprecated. Use buffers_adaptor::mutable_buffers_type instead.
 * static_buffer::mutable_data_type is deprecated. Use static_buffer::mutable_buffers_type instead.
 * static_buffer_base::mutable_data_type is deprecated. Use static_buffer_base::mutable_buffers_type instead.
+* flat_buffer::mutable_data_type is deprecated. Use flat_buffer::mutable_buffers_type instead.
 
 --------------------------------------------------------------------------------
 
diff --git a/include/boost/beast/core/flat_buffer.hpp b/include/boost/beast/core/flat_buffer.hpp
index f9b7ba26..ec0f63ec 100644
--- a/include/boost/beast/core/flat_buffer.hpp
+++ b/include/boost/beast/core/flat_buffer.hpp
@@ -396,7 +396,6 @@ public:
     /// The ConstBufferSequence used to represent the readable bytes.
     using const_buffers_type = net::const_buffer;
 
-    /// The MutableBufferSequence used to represent the readable bytes.
     using mutable_data_type = net::mutable_buffer;
 
     /// The MutableBufferSequence used to represent the writable bytes.
@@ -438,7 +437,7 @@ public:
     }
 
     /// Returns a mutable buffer sequence representing the readable bytes
-    mutable_data_type
+    mutable_buffers_type
     data() noexcept
     {
         return {in_, dist(in_, out_)};