diff --git a/CHANGELOG.md b/CHANGELOG.md
index ddaa6efd..cc2e7caa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ Version 61:
 * Tidy up some integer conversion warnings
 * Add message::header_part()
 
+API Changes:
+
+* header::version is unsigned
+
 --------------------------------------------------------------------------------
 
 Version 60:
diff --git a/doc/concept/FieldsReader.qbk b/doc/concept/FieldsReader.qbk
index aae62cd3..3a8e52d8 100644
--- a/doc/concept/FieldsReader.qbk
+++ b/doc/concept/FieldsReader.qbk
@@ -23,9 +23,9 @@ In this table:
 
 * `f` is a value of type `F`.
 
-* `v` is an integer representing the HTTP version.
+* `v` is an `unsigned` value representing the HTTP version.
 
-* `c` is an integer representing the HTTP status-code.
+* `c` is an `unsigned` representing the HTTP status-code.
 
 * `m` is a value of type [link beast.ref.beast__http__verb `verb`].
 
@@ -75,4 +75,23 @@ In this table:
 ]
 ]
 
+Exemplar:
+```
+struct FieldsReader
+{
+    // The type of buffers returned by `get`
+    using const_buffers_type = implementation-defined;
+
+    // Constructor for requests
+    FieldsReader(F const& f, unsigned version, verb method);
+
+    // Constructor for responses
+    FieldsReader(F const& f, unsigned version, unsigned status);
+
+    // Returns the serialized header buffers
+    const_buffers_type
+    get();
+};
+```
+
 [endsect]
diff --git a/doc/images/message.png b/doc/images/message.png
index 0ee1fe6e..e78bbcb0 100644
Binary files a/doc/images/message.png and b/doc/images/message.png differ
diff --git a/include/beast/http/impl/fields.ipp b/include/beast/http/impl/fields.ipp
index 9493873f..0e2d7013 100644
--- a/include/beast/http/impl/fields.ipp
+++ b/include/beast/http/impl/fields.ipp
@@ -135,12 +135,12 @@ public:
     template<class String>
     void
     prepare(String& s, basic_fields const& f,
-        int version, verb v);
+        unsigned version, verb v);
 
     template<class String>
     void
     prepare(String&s, basic_fields const& f,
-        int version, int code);
+        unsigned version, int code);
 
     basic_fields const& f_;
     static_string<max_static_start_line> ss_;
@@ -154,9 +154,11 @@ public:
             field_range,
             boost::asio::const_buffers_1>;
 
-    reader(basic_fields const& f, int version, verb v);
+    reader(basic_fields const& f,
+        unsigned version, verb v);
 
-    reader(basic_fields const& f, int version, int code);
+    reader(basic_fields const& f,
+        unsigned version, int code);
 
     const_buffers_type
     get() const
@@ -173,7 +175,7 @@ template<class String>
 void
 basic_fields<Allocator>::reader::
 prepare(String& s, basic_fields const& f,
-    int version, verb v)
+    unsigned version, verb v)
 {
     if(v == verb::unknown)
     {
@@ -214,7 +216,7 @@ template<class String>
 void
 basic_fields<Allocator>::reader::
 prepare(String& s,basic_fields const& f,
-    int version, int code)
+    unsigned version, int code)
 {
     if(version == 11)
     {
@@ -253,7 +255,8 @@ prepare(String& s,basic_fields const& f,
 
 template<class Allocator>
 basic_fields<Allocator>::reader::
-reader(basic_fields const& f, int version, verb v)
+reader(basic_fields const& f,
+        unsigned version, verb v)
     : f_(f)
 {
     try
@@ -270,7 +273,8 @@ reader(basic_fields const& f, int version, verb v)
 
 template<class Allocator>
 basic_fields<Allocator>::reader::
-reader(basic_fields const& f, int version, int code)
+reader(basic_fields const& f,
+        unsigned version, int code)
     : f_(f)
 {
     try
diff --git a/include/beast/http/message.hpp b/include/beast/http/message.hpp
index e9a1d028..1a39c757 100644
--- a/include/beast/http/message.hpp
+++ b/include/beast/http/message.hpp
@@ -63,13 +63,13 @@ struct header<true, Fields> : Fields
         This holds both the major and minor version numbers,
         using these formulas:
         @code
-            int major = version / 10;
-            int minor = version % 10;
+            unsigned major = version / 10;
+            unsigned minor = version % 10;
         @endcode
 
         Newly constructed headers will use HTTP/1.1 by default.
     */
-    int version = 11;
+    unsigned version = 11;
 
     /// Default constructor
     header() = default;
@@ -207,13 +207,13 @@ struct header<false, Fields> : Fields
         This holds both the major and minor version numbers,
         using these formulas:
         @code
-            major = version / 10;
-            minor = version % 10;
+            unsigned major = version / 10;
+            unsigned minor = version % 10;
         @endcode
 
         Newly constructed headers will use HTTP/1.1 by default.
     */
-    int version = 11;
+    unsigned version = 11;
 
     /// Default constructor.
     header() = default;