Standard's rules for adding "template" in expressions

In the following program:

     template< typename T >
     struct Base
     {
         template< typename U > U foo() const { return U(); }
     };

     template< typename T >
     struct Derived: Base<T>
     {
         T bar() const { return Base<T>::template foo<T>(); } // *
     };

     int main()
     {
         Derived<bool> o;
         o.bar();
     }

For the line marked "*", exactly where in the standard is the
requirement that "template" is added to designate foo as a function
template?

?5.1/7 refers to ?14.8.1, but I've scrutinized ?14.8.1, as well as other
places (including stepping through the search results for "template"!)
to no avail.

--
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A: Top-posting.
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