diff --git a/doc/TutorialSlicingIndexing.dox b/doc/TutorialSlicingIndexing.dox
index a1b00dfc4..fdb38e9f0 100644
--- a/doc/TutorialSlicingIndexing.dox
+++ b/doc/TutorialSlicingIndexing.dox
@@ -18,6 +18,21 @@ Each argument can be:
   - An ArithmeticSequence as constructed by the Eigen::seq, Eigen::seqN, or Eigen::placeholders::lastN functions.
   - Any 1D vector/array of integers including %Eigen's vector/array, expressions, std::vector, std::array, as well as plain C arrays: `int[N]`.
 
+The symbols \c last, \c lastp1, \c end, \c all, and \c lastN live in the Eigen::placeholders namespace,
+while \c seq, \c seqN, and \c fix live directly in the Eigen namespace.
+For convenience, they are all re-exported via the Eigen::indexing namespace.
+To make the code examples on this page compile, add one of the following:
+\code
+using namespace Eigen::indexing;
+// or individually:
+using Eigen::placeholders::last;
+using Eigen::placeholders::all;
+using Eigen::placeholders::lastN;
+using Eigen::seq;
+using Eigen::seqN;
+using Eigen::fix;
+\endcode
+
 More generally, it can accepts any object exposing the following two member functions:
   \code
   <integral type> operator[](<integral type>) const;
@@ -57,7 +72,7 @@ Taking a set of rows, columns, or elements, uniformly spaced within a matrix or
 </tr>
 </table>
 
-The \c firstIdx and \c lastIdx parameters can also be defined with the help of the Eigen::last symbol representing the index of the last row, column or element of the underlying matrix/vector once the arithmetic sequence is passed to it through operator().
+The \c firstIdx and \c lastIdx parameters can also be defined with the help of the Eigen::placeholders::last symbol representing the index of the last row, column or element of the underlying matrix/vector once the arithmetic sequence is passed to it through operator().
 Here are some examples for a 2D array/matrix \c A and a 1D array/vector \c v.
 <table class="manual">
 <tr>
@@ -148,7 +163,7 @@ Here comes \ref Eigen_placeholders_lastN :
 
 In terms of performance, %Eigen and the compiler can take advantage of compile-time size and increment.
 To this end, you can enforce compile-time parameters using Eigen::fix<val>.
-Such compile-time value can be combined with the Eigen::last symbol:
+Such compile-time value can be combined with the Eigen::placeholders::last symbol:
 \code v(seq(last-fix<7>, last-fix<2>))
 \endcode
 In this example %Eigen knowns at compile-time that the returned expression has 6 elements.