diff --git a/docs/release-notes.txt b/docs/release-notes.txt
index 3ca2d8ebc7f..8271ea3c1cb 100644
--- a/docs/release-notes.txt
+++ b/docs/release-notes.txt
@@ -8,6 +8,31 @@
  Version 0.15
 **************
 
+Version 0.15.4
+==============
+
+**Release Date:** May 12, 2021
+
+**New Features**
+
+-  Model Hub: Publish Determined's Model Hub library to make it easy to
+   train models from supported third-party libraries with a Determined
+   cluster. The first library supported in Model Hub is the `HuggingFace
+   transformers library for NLP
+   <https://huggingface.co/transformers>`__. See :ref:`model-hub` to get
+   started.
+
+**Minor Changes**
+
+-  API: Remove redundant APIs for commands, shells, TensorBoards, and
+   notebooks. The CLI now uses updated versions of these endpoints;
+   related CLI commands on versions 0.15.4 and beyond are not
+   backward-compatible with previous versions of Determined clusters.
+
+-  API: Update the trial detail endpoint (``GET /api/v1/trials/:id``),
+   dropping ``prior_batches_processed`` and ``num_inputs`` in favor of
+   ``total_batches``.
+
 Version 0.15.3
 ==============
 
diff --git a/docs/release-notes/2068-model-hub-transformers.txt b/docs/release-notes/2068-model-hub-transformers.txt
deleted file mode 100644
index f06c0bd87d3..00000000000
--- a/docs/release-notes/2068-model-hub-transformers.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-:orphan:
-
-**New Features**
-
--  Model Hub: We released Determined's Model Hub Library to make it easy
-   to train models from third-party libraries with a Determined cluster.
-   The first library supported in Model Hub is the `Huggingface
-   transformers library for NLP <https://huggingface.co/transformers>`_.
diff --git a/docs/release-notes/2321-delete-old-command-api.txt b/docs/release-notes/2321-delete-old-command-api.txt
deleted file mode 100644
index 6cebdfcb79d..00000000000
--- a/docs/release-notes/2321-delete-old-command-api.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-:orphan:
-
-**Improvements**
-
--  API: removed some old endpoints of Commands, Shells, TensorBoards,
-   and Shells. In the meantime, the CLI moves to the corresponding new
-   API endpoints. The latest CLI is not backwards compatible with the
-   old versions of clusters.
diff --git a/docs/release-notes/2345-drop-prior-batches-and-num-batches-trials.txt b/docs/release-notes/2345-drop-prior-batches-and-num-batches-trials.txt
deleted file mode 100644
index c5fa0f30a2f..00000000000
--- a/docs/release-notes/2345-drop-prior-batches-and-num-batches-trials.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-:orphan:
-
-**Changes**
-
--  Rest API: ``prior_batches_processed`` and ``num_inputs`` were dropped
-   in favor of ``total_batches`` for the trial detail API (``GET
-   /api/v1/trials/:id``).