diff --git a/2015.03.json b/2015.03.json
index 1d16dae0..beedfc7d 100644
--- a/2015.03.json
+++ b/2015.03.json
@@ -2,7 +2,7 @@
   "id": "2015.03",
   "schema": "1.2",
   "source": "http://git.openstack.org/cgit/openstack/defcore/",
-  "status": "approved",
+  "status": "superseded",
   "replaces": "2014.07",
   "releases": ["havana", "icehouse"],
   "platform": {
diff --git a/2015.04.json b/2015.04.json
index e09d5ade..585baa5e 100644
--- a/2015.04.json
+++ b/2015.04.json
@@ -2,7 +2,7 @@
   "id": "2015.04",
   "schema": "1.2",
   "source": "http://git.openstack.org/cgit/openstack/defcore/",
-  "status": "approved",
+  "status": "superseded",
   "replaces": "2015.03",
   "releases": ["havana", "icehouse", "juno"],
   "platform": {
diff --git a/doc/source/guidelines/2015.03.rst b/doc/source/guidelines/2015.03.rst
index 1bf31a9b..a0a8bb1e 100644
--- a/doc/source/guidelines/2015.03.rst
+++ b/doc/source/guidelines/2015.03.rst
@@ -2,7 +2,7 @@
 OpenStack DefCore 2015.03
 =========================
 
-:Status: approved
+:Status: superseded
 :Replaces: 2014.07
 :JSON Master: http://git.openstack.org/cgit/openstack/defcore/tree/2015.03.json
 
diff --git a/doc/source/guidelines/2015.04.rst b/doc/source/guidelines/2015.04.rst
index 742f5a10..9a72f0c8 100644
--- a/doc/source/guidelines/2015.04.rst
+++ b/doc/source/guidelines/2015.04.rst
@@ -2,7 +2,7 @@
 OpenStack DefCore 2015.04
 =========================
 
-:Status: approved
+:Status: superseded
 :Replaces: 2015.03
 :JSON Master: http://git.openstack.org/cgit/openstack/defcore/tree/2015.04.json
 
diff --git a/doc/source/process/2015B.rst b/doc/source/process/2015B.rst
index 3c5f3250..18f12bec 100644
--- a/doc/source/process/2015B.rst
+++ b/doc/source/process/2015B.rst
@@ -226,6 +226,21 @@ C5. API Usage Data Report
   2. To the extent the data is available, capabilities beyond the DefCore
      list will be included in the report.
 
+C6. Only Two Approved Guidelines at a time:
+
+  1. Vendors seeking Foundation validation are limited to using the two
+     latest approved Guidelines.
+
+  2. Since past validations are respected, older Guidelines will be
+     maintained as superseded for historical reference.
+
+  3. Guideline status progresses as follows:
+
+  :draft: initial work, pre-summit (S-3) discussion material
+  :preliminary: as presented at summit (S) for community review
+  :approved: board approved, one of the two official guidelines
+  :superseded: board approved, now superseded by two latest guidelines
+
 Guideline Approval (D)
 ^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/doc/source/schema/1.3.rst b/doc/source/schema/1.3.rst
index e3134d65..2bcc646e 100644
--- a/doc/source/schema/1.3.rst
+++ b/doc/source/schema/1.3.rst
@@ -21,7 +21,7 @@ Changes from v1.2
     "schema": "1.3",        # Schema version
     "reference": "http://github.com/openstack/defcore/schema.1.3.rst", # Schema description
     "source": "http://git.openstack.org/cgit/openstack/defcore/",   # git repo for files
-    "status": "approved",   # can be draft, review or approved
+    "status": "approved",   # can be draft, review, approved or superseded [see 2015B C6.3]
     "replaces": "2014.07",  # previous spec
     "releases": ["icehouse"], # array of releases, lower case (generally three releases)
     "platform": {           # platform components