diff --git a/13_loading_and_preprocessing_data.ipynb b/13_loading_and_preprocessing_data.ipynb
index 997e458..f6f6993 100644
--- a/13_loading_and_preprocessing_data.ipynb
+++ b/13_loading_and_preprocessing_data.ipynb
@@ -1493,6 +1493,13 @@
     "dataset = dataset.repeat().shuffle(10000).batch(batch_size).map(parse_examples)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**Warning**: the `DenseFeatures` layer currently does not work with the Functional API, see [TF issue #27416](https://github.com/tensorflow/tensorflow/issues/27416). Hopefully this will be resolved before the final release of TF 2.0."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 98,
diff --git a/work_in_progress/16_reinforcement_learning.ipynb b/18_reinforcement_learning.ipynb
similarity index 100%
rename from work_in_progress/16_reinforcement_learning.ipynb
rename to 18_reinforcement_learning.ipynb