diff --git a/source/containers.tex b/source/containers.tex
index 6b21510357..9c54aaf537 100644
--- a/source/containers.tex
+++ b/source/containers.tex
@@ -18321,6 +18321,7 @@
 
     // \ref{span.elem}, element access
     constexpr reference operator[](size_type idx) const;
+    constexpr reference at(size_type idx) const;                            // freestanding-deleted
     constexpr reference front() const;
     constexpr reference back() const;
     constexpr pointer data() const noexcept;
@@ -18839,6 +18840,21 @@
 Equivalent to: \tcode{return *(data() + idx);}
 \end{itemdescr}
 
+\indexlibrarymember{span}{at}%
+\begin{itemdecl}
+constexpr reference at(size_type idx) const;
+\end{itemdecl}
+
+\begin{itemdescr}
+\pnum
+\returns
+\tcode{*(data() + idx)}.
+
+\pnum
+\throws
+\tcode{out_of_range} if \tcode{idx >= size()} is \tcode{true}.
+\end{itemdescr}
+
 \indexlibrarymember{span}{front}%
 \begin{itemdecl}
 constexpr reference front() const;
diff --git a/source/support.tex b/source/support.tex
index 5585197c93..f867e7d5f9 100644
--- a/source/support.tex
+++ b/source/support.tex
@@ -761,7 +761,7 @@
 #define @\defnlibxname{cpp_lib_smart_ptr_for_overwrite}@           202002L // also in \libheader{memory}
 #define @\defnlibxname{cpp_lib_smart_ptr_owner_equality}@          202306L // also in \libheader{memory}
 #define @\defnlibxname{cpp_lib_source_location}@                   201907L // freestanding, also in \libheader{source_location}
-#define @\defnlibxname{cpp_lib_span}@                              202002L // also in \libheader{span}
+#define @\defnlibxname{cpp_lib_span}@                              202311L // also in \libheader{span}
 #define @\defnlibxname{cpp_lib_span_initializer_list}@             202311L // also in \libheader{span}
 #define @\defnlibxname{cpp_lib_spanstream}@                        202106L // also in \libheader{spanstream}
 #define @\defnlibxname{cpp_lib_ssize}@                             201902L // freestanding, also in \libheader{iterator}