Add note about inconsitency of which dates git-log uses by default

diff --git a/tour.mdwn b/tour.mdwn
index c72bffe0a030a68ea92daf4b706fe8f9503d98b7..53f8f2ca8cc7e7fcec82c06c5a05a9eb1508c00c 100644 (file)
--- a/tour.mdwn
+++ b/tour.mdwn
@@ -397,6 +397,10 @@ created:
 
        $ git log --since="2 weeks ago" --until="yesterday"
 
+       [XXX: By default, "git log" displays author dates as "Date"
+       but then uses commit dates when given a --since option. That
+       seems like broken defaults to me. Why the inconsistency?]
+
 Another useful option is -n or --max-count which, unsurprisingly,
 limits the maximum number of commits to be displayed.