diff --git a/sys/amd64/conf/GENERIC b/sys/amd64/conf/GENERIC
--- a/sys/amd64/conf/GENERIC
+++ b/sys/amd64/conf/GENERIC
@@ -16,6 +16,17 @@
 # If you are in doubt as to the purpose or necessity of a line, check first
 # in NOTES.
 #
+# WARNING: GENERIC is intended to be suitable for all users, and is the most
+# tested configuration.  It is advised not to deviate from it unless there is
+# genuinely no alternative.  Although good programming and design considerably
+# limit unexpected cross-impacts of activating/deactivating some options, there
+# is no guarantee that such problems don't exist.  As you tweak your kernel
+# configuration, you are encouraged to specifically test your resulting system
+# with respect to your intended workloads.  You will also be likely to have to
+# fix the occasional compile error and/or revert to a GENERIC kernel to
+# reproduce the issues you encounter and/or investigate and fix them yourself if
+# they cannot be reproduced with GENERIC.
+#
 
 cpu		HAMMER
 ident		GENERIC