Fix typo in STL docs.
diff --git a/docs/advanced.rst b/docs/advanced.rst
index 0b08b49..154c65f 100644
--- a/docs/advanced.rst
+++ b/docs/advanced.rst
@@ -357,7 +357,7 @@
===========================
When including the additional header file :file:`pybind11/stl.h`, conversions
-between ``std::vector<>``, ``std::map<>``, and ``std::map<>`` and the Python
+between ``std::vector<>``, ``std::set<>``, and ``std::map<>`` and the Python
``list``, ``set`` and ``dict`` data structures are automatically enabled. The
types ``std::pair<>`` and ``std::tuple<>`` are already supported out of the box
with just the core :file:`pybind11/pybind11.h` header.