diff --git a/doc/pointer_traits.qbk b/doc/pointer_traits.qbk
index 716d815..ce0d7b8 100644
--- a/doc/pointer_traits.qbk
+++ b/doc/pointer_traits.qbk
@@ -121,7 +121,8 @@ also not defined (`pointer_traits` is SFINAE-friendly).
 [[`static pointer pointer_traits::pointer_to(element_type& v);`]
 [[variablelist
 [[Remark]
-[If `element_type` is a void type, this member is not defined.]]
+[If `element_type` is a void type, or if `T::pointer_to(v)` is not well formed,
+  this member is not defined.]]
 [[Returns]
 [A pointer to `v` obtained by calling `T::pointer_to(v)`.]]]]]
 [[`static pointer pointer_traits<T*>::pointer_to(element_type& v) noexcept;`]