diff --git a/cmd/influxd/backup/backup.go b/cmd/influxd/backup/backup.go
index 448d0ac0c3..011f0fe0c9 100644
--- a/cmd/influxd/backup/backup.go
+++ b/cmd/influxd/backup/backup.go
@@ -368,7 +368,7 @@ Usage: influxd backup [flags] PATH
             Optional. The retention policy to backup.
     -shard <id>
             Optional. The shard id to backup. If specified, retention is required.
-    -since <2015-12-24T08:12:23>
+    -since <2015-12-24T08:12:23Z>
             Optional. Do an incremental backup since the passed in RFC3339
             formatted time.
 
diff --git a/man/influxd-backup.txt b/man/influxd-backup.txt
index 74723742c9..d7177ba3b3 100644
--- a/man/influxd-backup.txt
+++ b/man/influxd-backup.txt
@@ -27,7 +27,7 @@ OPTIONS
 -shard <id>::
   The shard id to backup. Optional. If specified, '-retention <name>' is required.
 
--since <2015-12-24T08:12:13>::
+-since <2015-12-24T08:12:13Z>::
   Do an incremental backup since the passed in time. The time needs to be in the RFC3339 format. Optional.
 
 SEE ALSO