From 8207d74330bfa214144bac70db8b4dd5f0c3f3b1 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Thu, 2 Jan 2020 12:34:40 +0100
Subject: doc: add missing doc for operator-

---
 doc/src/index.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'doc')

diff --git a/doc/src/index.rst b/doc/src/index.rst
index 6c341c2..7f75ec4 100644
--- a/doc/src/index.rst
+++ b/doc/src/index.rst
@@ -284,6 +284,15 @@ Arithmetic Operators
 
    **enablement:** This operator shall be available iff. a) :cpp:type:`new_type<BaseType, TagType, DerivationClause>::base_type` is addable using the operator :literal:`+` and b) :cpp:type:`DerivationClause` includes :cpp:var:`Arithmetic`.
 
+.. cpp:function:: template<typename BaseType, \
+                  typename TagType, \
+                  auto DerivationClause> \
+                  constexpr new_type<BaseType, TagType, DerivationClause> operator-(new_type<BaseType, TagType, DerivationClause> const & lhs, new_type<BaseType, TagType, DerivationClause> const & rhs)
+
+   **noexcept specification:** This input operator shall be noexcept iff. :cpp:type:`new_type<BaseType, TagType, DerivationClause>::base_type` is nothrow subtractable as well as nothrow copy-constructible.
+
+   **enablement:** This operator shall be available iff. a) :cpp:type:`new_type<BaseType, TagType, DerivationClause>::base_type` is subtractable using the operator :literal:`-` and b) :cpp:type:`DerivationClause` includes :cpp:var:`Arithmetic`.
+
 Header :literal:`<newtype/derivable.hpp>`
 =========================================
 
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