diff --git a/include/boost/unordered/unordered_map.hpp b/include/boost/unordered/unordered_map.hpp
index 8da55311..8b5fffe2 100644
--- a/include/boost/unordered/unordered_map.hpp
+++ b/include/boost/unordered/unordered_map.hpp
@@ -153,6 +153,10 @@ template <class K, class T, class H, class P, class A> class unordered_map
     }
 
     unordered_map& operator=(BOOST_RV_REF(unordered_map) x)
+    // C++17 support: BOOST_NOEXCEPT_IF(
+    //    value_allocator_traits::is_always_equal::value &&
+    //    is_nothrow_move_assignable_v<H> &&
+    //    is_nothrow_move_assignable_v<P>)
     {
         table_.move_assign(x.table_);
         return *this;
@@ -166,6 +170,10 @@ template <class K, class T, class H, class P, class A> class unordered_map
 
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
     unordered_map& operator=(unordered_map&& x)
+    // C++17 support: BOOST_NOEXCEPT_IF(
+    //    value_allocator_traits::is_always_equal::value &&
+    //    is_nothrow_move_assignable_v<H> &&
+    //    is_nothrow_move_assignable_v<P>)
     {
         table_.move_assign(x.table_);
         return *this;
@@ -868,6 +876,10 @@ template <class K, class T, class H, class P, class A> class unordered_multimap
     }
 
     unordered_multimap& operator=(BOOST_RV_REF(unordered_multimap) x)
+    // C++17 support: BOOST_NOEXCEPT_IF(
+    //    value_allocator_traits::is_always_equal::value &&
+    //    is_nothrow_move_assignable_v<H> &&
+    //    is_nothrow_move_assignable_v<P>)
     {
         table_.move_assign(x.table_);
         return *this;
@@ -881,6 +893,10 @@ template <class K, class T, class H, class P, class A> class unordered_multimap
 
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
     unordered_multimap& operator=(unordered_multimap&& x)
+    // C++17 support: BOOST_NOEXCEPT_IF(
+    //    value_allocator_traits::is_always_equal::value &&
+    //    is_nothrow_move_assignable_v<H> &&
+    //    is_nothrow_move_assignable_v<P>)
     {
         table_.move_assign(x.table_);
         return *this;
diff --git a/include/boost/unordered/unordered_set.hpp b/include/boost/unordered/unordered_set.hpp
index 52e357f1..52136bc6 100644
--- a/include/boost/unordered/unordered_set.hpp
+++ b/include/boost/unordered/unordered_set.hpp
@@ -151,6 +151,10 @@ template <class T, class H, class P, class A> class unordered_set
     }
 
     unordered_set& operator=(BOOST_RV_REF(unordered_set) x)
+    // C++17 support: BOOST_NOEXCEPT_IF(
+    //    value_allocator_traits::is_always_equal::value &&
+    //    is_nothrow_move_assignable_v<H> &&
+    //    is_nothrow_move_assignable_v<P>)
     {
         table_.move_assign(x.table_);
         return *this;
@@ -164,6 +168,10 @@ template <class T, class H, class P, class A> class unordered_set
 
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
     unordered_set& operator=(unordered_set&& x)
+    // C++17 support: BOOST_NOEXCEPT_IF(
+    //    value_allocator_traits::is_always_equal::value &&
+    //    is_nothrow_move_assignable_v<H> &&
+    //    is_nothrow_move_assignable_v<P>)
     {
         table_.move_assign(x.table_);
         return *this;
@@ -609,6 +617,10 @@ template <class T, class H, class P, class A> class unordered_multiset
     }
 
     unordered_multiset& operator=(BOOST_RV_REF(unordered_multiset) x)
+    // C++17 support: BOOST_NOEXCEPT_IF(
+    //    value_allocator_traits::is_always_equal::value &&
+    //    is_nothrow_move_assignable_v<H> &&
+    //    is_nothrow_move_assignable_v<P>)
     {
         table_.move_assign(x.table_);
         return *this;
@@ -622,6 +634,10 @@ template <class T, class H, class P, class A> class unordered_multiset
 
 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
     unordered_multiset& operator=(unordered_multiset&& x)
+    // C++17 support: BOOST_NOEXCEPT_IF(
+    //    value_allocator_traits::is_always_equal::value &&
+    //    is_nothrow_move_assignable_v<H> &&
+    //    is_nothrow_move_assignable_v<P>)
     {
         table_.move_assign(x.table_);
         return *this;