diff --git a/api-ref/source/os-certificates.inc b/api-ref/source/os-certificates.inc
index d97298c7a3..af215ace3f 100644
--- a/api-ref/source/os-certificates.inc
+++ b/api-ref/source/os-certificates.inc
@@ -6,6 +6,14 @@
 
 Creates and shows details for a root certificate.
 
+.. note::
+
+   This API existed solely because of the need to build euca bundles
+   when Nova had an in tree EC2 API. It no longer interacts with any
+   parts of the system besides it's own certificate daemon. It should
+   be considered vestigial, and will likely be deprecated and removed
+   in the near future.
+
 Create Root Certificate
 =======================