diff --git a/include/boost/container/stable_vector.hpp b/include/boost/container/stable_vector.hpp
index 8e8c0fd..69d3718 100644
--- a/include/boost/container/stable_vector.hpp
+++ b/include/boost/container/stable_vector.hpp
@@ -1293,11 +1293,10 @@ class stable_vector
       return (this->index.empty()) ? this->cend() : iterator(node_ptr_traits::static_cast_from(this->index[n]));
    }
 
-   //! <b>Requires</b>: size() >= n.
+   //! <b>Requires</b>: begin() <= p <= end().
    //!
-   //! <b>Effects</b>: Returns an iterator to the nth element
-   //!   from the beginning of the container. Returns end()
-   //!   if n == size().
+   //! <b>Effects</b>: Returns the index of the element pointed by p
+   //!   and size() if p == end().
    //!
    //! <b>Throws</b>: Nothing.
    //!