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-rw-r--r--doc/devel.rst6
1 files changed, 5 insertions, 1 deletions
diff --git a/doc/devel.rst b/doc/devel.rst
index 47d9f5c..32a63f7 100644
--- a/doc/devel.rst
+++ b/doc/devel.rst
@@ -69,11 +69,15 @@ installation is complete.
prepare_apt_source
------------------
-The final Debian mirror location is not useful during the build as there
+The final Debian mirror location is not useful during the build when there
is a faster mirror available during the build. This function moves the
specified mirror file aside and uses the nearby mirror. Always use with
:ref:`replace_apt_source`.
+Ensure that the mirror and suite are passed as arguments to prepare_apt_source::
+
+ prepare_apt_source http://mirror/debian jessie
+
.. _remove_daemon_block:
remove_daemon_block