diff --git a/source/memory.tex b/source/memory.tex
index 4375357a4d..66830d4057 100644
--- a/source/memory.tex
+++ b/source/memory.tex
@@ -562,7 +562,7 @@
       using type = TagT;
     };
 
-  template<class Ptr, unsigned BitsRequested, class TagT>
+  template<size_t I, class Ptr, unsigned BitsRequested, class TagT>
     constexpr tuple_element_t<I, pointer_tag_pair<Ptr, BitsRequested, TagT>>        // freestanding
       get(pointer_tag_pair<Ptr, BitsRequested, TagT> p) noexcept;
 
@@ -2567,7 +2567,7 @@
 
 \indexlibrarymember{get}{pointer_tag_pair}%
 \begin{itemdecl}
-template<class Ptr, unsigned BitsRequested, class TagT>
+template<size_t I, class Ptr, unsigned BitsRequested, class TagT>
   constexpr tuple_element_t<I, pointer_tag_pair<Ptr, BitsRequested, TagT>>
     get(pointer_tag_pair<Ptr, BitsRequested, TagT> p) noexcept;
 \end{itemdecl}