diff --git a/include/continuable/continuable-base.hpp b/include/continuable/continuable-base.hpp
index 7d413f3..1c13e42 100644
--- a/include/continuable/continuable-base.hpp
+++ b/include/continuable/continuable-base.hpp
@@ -48,6 +48,7 @@
 namespace cti {
 template <typename Data, typename Annotation>
 class continuable_base {
+
   /// \cond false
   template <typename, typename>
   friend class continuable_base;
@@ -601,6 +602,8 @@ auto make_continuable(Continuation&& continuation) {
 /// // Will receive errors and results
 /// continuable.then(my_callable{});
 /// ```
+///
+/// \since version 2.0.0
 using detail::types::dispatch_error_tag;
 
 /// Represents the type that is used as error type
@@ -610,6 +613,8 @@ using detail::types::dispatch_error_tag;
 /// will be a `std::error_condition`.
 /// A custom error type may be set through
 /// defining `CONTINUABLE_WITH_CUSTOM_ERROR_TYPE`.
+///
+/// \since version 2.0.0
 using detail::types::error_type;
 
 /// Connects the given continuables with an *all* logic.
diff --git a/include/continuable/continuable-promise-base.hpp b/include/continuable/continuable-promise-base.hpp
index f48a564..a48122c 100644
--- a/include/continuable/continuable-promise-base.hpp
+++ b/include/continuable/continuable-promise-base.hpp
@@ -40,11 +40,19 @@
 #include <continuable/detail/util.hpp>
 
 namespace cti {
+/// The promise_base makes it possible to resolve an asynchronous
+/// continuable through it's result or through an error type.
+///
+/// Use the promise type defined in `continuable/continuable.hpp`,
+/// in order to use this class.
+///
+/// \since version 2.0.0
 template <typename Data, typename Hint>
 class promise_base;
 template <typename Data, typename... Args>
 class promise_base<Data, detail::hints::signature_hint_tag<Args...>>
     : detail::util::non_copyable {
+
   /// \cond false
   // The callback type
   Data data_;
@@ -62,21 +70,29 @@ public:
   }
 
   /// Resolves the continuation with the given values
+  ///
+  /// \since version 2.0.0
   void operator()(Args... args) {
     data_(std::move(args)...);
   }
   /// Resolves the continuation with the given exception
+  ///
+  /// \since version 2.0.0
   void operator()(detail::types::dispatch_error_tag tag,
                   detail::types::error_type exception) {
     data_(tag, std::move(exception));
   }
 
   /// Resolves the continuation with the given values
+  ///
+  /// \since version 2.0.0
   void set_value(Args... args) {
     data_(std::move(args)...);
   }
 
   /// Resolves the continuation with the given exception
+  ///
+  /// \since version 2.0.0
   void set_exception(detail::types::error_type exception) {
     data_(detail::types::dispatch_error_tag{}, std::move(exception));
   }
diff --git a/include/continuable/detail/api.hpp b/include/continuable/detail/api.hpp
index 0933d2e..36a8d84 100644
--- a/include/continuable/detail/api.hpp
+++ b/include/continuable/detail/api.hpp
@@ -51,6 +51,9 @@ namespace cti {
 /// The most important method is the cti::continuable_base::then() method,
 /// which allows to attach a callback to the continuable.
 ///
+/// Use the continuable types defined in `continuable/continuable.hpp`,
+/// in order to use this class.
+///
 /// \tparam Data The internal data which is used to store the current
 ///         continuation and intermediate lazy connection result.
 ///