diff --git a/stackrc b/stackrc
index 3033b27..76a5756 100644
--- a/stackrc
+++ b/stackrc
@@ -103,6 +103,16 @@
 # be disabled for automated testing by setting this value to False.
 USE_SCREEN=True
 
+# When using screen, should we keep a log file on disk?  You might
+# want this False if you have a long-running setup where verbose logs
+# can fill-up the host.
+# XXX: Ideally screen itself would be configured to log but just not
+# activate.  This isn't possible with the screerc syntax.  Temporary
+# logging can still be used by a developer with:
+#    C-a : logfile foo
+#    C-a : log on
+SCREEN_IS_LOGGING=$(trueorfalse True SCREEN_IS_LOGGING)
+
 # Passwords generated by interactive devstack runs
 if [[ -r $RC_DIR/.localrc.password ]]; then
     source $RC_DIR/.localrc.password