design/cryptography-principles: underscore that the list is sorted

Updates golang/go#32466

Change-Id: I5ad26960d48387b97331f050b86e2d4249c099ba
Reviewed-by: Andrew Bonventre <>
diff --git a/design/ b/design/
index 4e97b18..b6df115 100644
--- a/design/
+++ b/design/
@@ -53,6 +53,11 @@
 > expected that most functionality will be implemented by
 > third-party projects first, and that’s ok.
+Note that this is an ordered list, from highest to lowest
+priority. For example, an insecure implementation or unsafe API
+will not be considered, even if it enables more use cases or is
+more performant.
 The Go cryptography libraries are the `crypto/...` and