diff --git a/sys/sparc64/conf/NOTES b/sys/sparc64/conf/NOTES
index 211165a1fe8a..e189286bd900 100644
--- a/sys/sparc64/conf/NOTES
+++ b/sys/sparc64/conf/NOTES
@@ -129,6 +129,7 @@ nodevice	ex
 # Options we don't want to deal with
 
 nooption	FDC_DEBUG
+nooption	COMPAT_FREEBSD4
 nooption	SC_RENDER_DEBUG
 nooption	SC_DEBUG_LEVEL
 nooption	PPC_DEBUG