doco update

diff --git a/doc/async-backend.rst b/doc/async-backend.rst
index ad3de008a44ea7096caa44088d405d3be431a6fe..5d6d5a2b077935ee83e2ccd8e28650a75e0de082 100644 (file)
--- a/doc/async-backend.rst
+++ b/doc/async-backend.rst
@@ -9,8 +9,8 @@ the library-specific functionality needed by the generic asynchronous
 DNS code.
 
 Dnspython attempts to determine which backend is in use by "sniffing" for it
-with the ``sniffio`` module if it is installed, otherwise it assumes asyncio
-is in use.
+with the ``sniffio`` module if it is installed.  If sniffio is not available,
+dnspython try to detect asyncio directly.
 
 .. autofunction:: dns.asyncbackend.get_default_backend
 .. autofunction:: dns.asyncbackend.set_default_backend