Add note about key ordering
diff --git a/src/couch_log/test/eunit/couch_log_formatter_test.erl b/src/couch_log/test/eunit/couch_log_formatter_test.erl
index 6fd2579..29d5497 100644
--- a/src/couch_log/test/eunit/couch_log_formatter_test.erl
+++ b/src/couch_log/test/eunit/couch_log_formatter_test.erl
@@ -38,6 +38,8 @@
         bar => "barStr",
         baz => baz
     }),
+    % NOTE: this currently hardcodes the ordering of the keys, however, map
+    % key order is not guaranteed and this may break.
     Formatted = "[foo=123 baz=\"baz\" bar=\"barStr\"]",
     ?assertEqual(Formatted, lists:flatten(Entry#log_entry.msg)).