diff --git a/Documentation/doc/Documentation/General.txt b/Documentation/doc/Documentation/General.txt
index f35f45139c2..1307be68ce8 100644
--- a/Documentation/doc/Documentation/General.txt
+++ b/Documentation/doc/Documentation/General.txt
@@ -85,6 +85,48 @@ public:
   result_type operator()(first_argument_type, second_argument_type, third_argument_type);
 };
 
+/// \cgalConcept
+/// Adaptable functor with four arguments
+/// \cgalRefines{AdaptableFunctor}
+class AdaptableQuaternaryFunction
+{
+public:
+  /// result_type
+  typedef unspecified_type result_type;
+  /// first argument_type
+  typedef unspecified_type first_argument_type;
+  /// second argument_type
+  typedef unspecified_type second_argument_type;
+  /// third argument_type
+  typedef unspecified_type third_argument_type;
+  /// fourth argument_type
+  typedef unspecified_type fourth_argument_type;
+  /// operator type
+  result_type operator()(first_argument_type, second_argument_type, third_argument_type, fourth_argument_type);
+};
+
+/// \cgalConcept
+/// Adaptable functor with five arguments
+/// \cgalRefines{AdaptableFunctor}
+class AdaptableQuinaryFunction
+{
+public:
+  /// result_type
+  typedef unspecified_type result_type;
+  /// first argument_type
+  typedef unspecified_type first_argument_type;
+  /// second argument_type
+  typedef unspecified_type second_argument_type;
+  /// third argument_type
+  typedef unspecified_type third_argument_type;
+  /// fourth argument_type
+  typedef unspecified_type fourth_argument_type;
+  /// fifth argument_type
+  typedef unspecified_type fifth_argument_type;
+  /// operator type
+  result_type operator()(first_argument_type, second_argument_type, third_argument_type, fourth_argument_type, fifth_argument_type);
+};
+
 /// \cgalConcept
 /// Concept from the \cpp standard.
 /// See https://en.cppreference.com/w/cpp/named_req/Iterator