Add libpq version discovery

2 files changed, 16 insertions, 0 deletions

diff --git a/doc/src/extensions.rst b/doc/src/extensions.rst
index dea1041..3f01066 100644
--- a/doc/src/extensions.rst
+++ b/doc/src/extensions.rst
@@ -197,6 +197,16 @@ functionalities defined by the |DBAPI|_.
 
     .. versionadded:: 2.2.0
 
+.. function:: libpq_version()
+
+    Query actual ``libpq`` version loaded.
+
+    This function throws `NotSupportedError` if it was compiled with
+    ``libpq < 9.1``.
+
+    .. seealso:: libpq docs for `PQlibVersion()`__
+
+        .. __: http://www.postgresql.org/docs/current/static/libpq-misc.html#LIBPQ-PQLIBVERSION
 
 .. _sql-adaptation-objects:
 
diff --git a/doc/src/module.rst b/doc/src/module.rst
index 8de9f87..bd6bcf4 100644
--- a/doc/src/module.rst
+++ b/doc/src/module.rst
@@ -109,6 +109,12 @@ The module interface respects the standard defined in the |DBAPI|_.
     by the interface.  For `psycopg2` is ``pyformat``.  See also
     :ref:`query-parameters`.
 
+.. data:: __libpq_version__
+
+   Integer contant containing the version of ``libpq`` this `psycopg2`
+   module was compiled with.  If this value is ``>= 90100`` then you
+   may query for the actually loaded version of libpq using
+   `~psycopg2.extensions.libpq_version()`.
 
 
 .. index::