diff --git a/doc/source/specs/backlog/index.rst b/doc/source/specs/backlog/index.rst
index 02a5433cb..4caad5f14 100644
--- a/doc/source/specs/backlog/index.rst
+++ b/doc/source/specs/backlog/index.rst
@@ -24,8 +24,4 @@ Template:
 
 Approved (but not implemented) backlog specs:
 
-.. toctree::
-   :glob:
-   :maxdepth: 1
-
-   approved/*
+None currently
diff --git a/specs/backlog/approved/flavor-class.rst b/specs/abandoned/flavor-class.rst
similarity index 96%
rename from specs/backlog/approved/flavor-class.rst
rename to specs/abandoned/flavor-class.rst
index efc4ff470..36be28e0e 100644
--- a/specs/backlog/approved/flavor-class.rst
+++ b/specs/abandoned/flavor-class.rst
@@ -8,6 +8,9 @@
 Flavor classes
 ==============
 
+.. note:: This spec was abandoned by efried on account of having been
+          sitting in the backlog directory since 2015.
+
 As an operator I would like to be able to define policy and quotas differently
 for different sets of hardware.
 
@@ -180,3 +183,5 @@ time.
      - Description
    * - Liberty
      - Introduced
+   * - Train
+     - Abandoned
diff --git a/specs/backlog/redirects b/specs/backlog/redirects
index 4dc9cd621..dcf9b0e49 100644
--- a/specs/backlog/redirects
+++ b/specs/backlog/redirects
@@ -1,3 +1,4 @@
+approved/flavor-class.rst ../../abandoned/flavor-class.rst
 approved/instance-tasks.rst ../../abandoned/instance-tasks.rst
 approved/parallel-scheduler.rst ../../abandoned/parallel-scheduler.rst
 approved/same-instances-scheduling.rst ../../abandoned/same-instances-scheduling.rst