diff --git a/share/man/man4/isp.4 b/share/man/man4/isp.4
index 94d4563803f0..7e377653be57 100644
--- a/share/man/man4/isp.4
+++ b/share/man/man4/isp.4
@@ -65,6 +65,11 @@ be contingent upon the correct firmware being loaded).
 Firmware is now available if the
 .Xr ispfw 4
 module is loaded during bootstrap (q.v.).
+.Pp
+It is very strongly recommended that you use the firmware available
+from
+.Xr ispfw 4
+as it is the most likely to have been tested with this driver.
 .Sh HARDWARE
 Supported cards include:
 .Pp