doc: recommendations related to performances / cleanup

Signed-off-by: Loic Dachary <ldachary@redhat.com>

diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index ed7e4eadc1175f427c7170b20bcc47d812de868d..3bc51fd4184e5d1368f7ff41c5845fc0a2a3461d 100644 (file)
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -6,5 +6,13 @@ For documentation patches the the following guide will help you get started
 
 `Documenting Ceph`_
 
+Performance enhancements must come with test data and detailed
+explanations.
+
+Code cleanup is appreciated along with a patch that fixes a bug or
+implements a feature. Except on rare occasions, code cleanup that only
+involve coding style or whitespace modifications are discouraged,
+primarily because they cause problems when rebasing and backporting.
+
 .. _Submitting Patches: SubmittingPatches
 .. _Documenting Ceph:  doc/start/documenting-ceph.rst