diff --git a/doc/endian/arithmetic.adoc b/doc/endian/arithmetic.adoc
index 891a3a6..4fe75a1 100644
--- a/doc/endian/arithmetic.adoc
+++ b/doc/endian/arithmetic.adoc
@@ -244,7 +244,8 @@ namespace boost
       endian_arithmetic& operator=(T v) noexcept;
       operator value_type() const noexcept;
       value_type value() const noexcept; // for exposition; see endian_buffer
-      const char* data() const noexcept; // for exposition; see endian_buffer
+      unsigned char* data() noexcept; // for exposition; see endian_buffer
+      unsigned char const* data() const noexcept; // for exposition; see endian_buffer
 
       // arithmetic operations
       //   note that additional operations are provided by the value_type
diff --git a/doc/endian/buffers.adoc b/doc/endian/buffers.adoc
index a9ca02e..6de03cd 100644
--- a/doc/endian/buffers.adoc
+++ b/doc/endian/buffers.adoc
@@ -231,12 +231,13 @@ namespace boost
       explicit endian_buffer(T v) noexcept;
 
       endian_buffer& operator=(T v) noexcept;
-      value_type     value() const noexcept;
-      const char*    data() const noexcept;
+      value_type value() const noexcept;
+      unsigned char* data() noexcept;
+      unsigned char const* data() const noexcept;
 
     private:
 
-      unsigned char value_[ Nbits / CHAR_BIT]; // exposition only
+      unsigned char value_[Nbits / CHAR_BIT]; // exposition only
     };
 
     //  stream inserter
@@ -425,7 +426,10 @@ value_type value() const noexcept;
 Returns:: `endian_load<T, Nbits/8, Order>( value_ )`.
 
 ```
-const char* data() const noexcept;
+unsigned char* data() noexcept;
+```
+```
+unsigned char const* data() const noexcept;
 ```
 [none]
 * {blank}
diff --git a/doc/endian/changelog.adoc b/doc/endian/changelog.adoc
index f92a59e..2fd1b87 100644
--- a/doc/endian/changelog.adoc
+++ b/doc/endian/changelog.adoc
@@ -16,6 +16,7 @@ http://www.boost.org/LICENSE_1_0.txt
   on GCC and Clang
 * Added convenience load and store functions
 * Added floating point convenience typedefs
+* Added a non-const overload of `data()`; changed its return type to `unsigned char*`
 
 ## Changes in 1.71.0