-If \fIcontroller\fR is omitted, \fBovs\-openflowd\fR attempts to discover the
-location of the controller automatically (see below).
-
-.SS "Contacting the Controller"
-The OpenFlow switch must be able to contact the OpenFlow controller
+When multiple controllers are configured, \fBovs\-openflowd\fR
+connects to all of them simultaneously. OpenFlow 1.0 does not specify
+how multiple controllers coordinate in interacting with a single
+switch, so more than one controller should be specified only if the
+controllers are themselves designed to coordinate with each other.
+(The Nicira-defined \fBNXT_ROLE\fR OpenFlow vendor extension may be
+useful for this.)
+.PP
+If no \fIcontroller\fR is specified, \fBovs\-openflowd\fR attempts to
+discover the location of a controller automatically (see below).
+.
+.SS "Contacting Controllers"
+The OpenFlow switch must be able to contact the OpenFlow controllers