diff --git a/CHANGES.txt b/CHANGES.txt
index 77b9a92b1a..e574d16346 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,8 +1,9 @@
 4.0
- * minor network authz improvements (Cassandra-14413)
+ * Clean up build artifacts in docs container (CASSANDRA-14432)
+ * Minor network authz improvements (Cassandra-14413)
  * Automatic sstable upgrades (CASSANDRA-14197)
  * Replace deprecated junit.framework.Assert usages with org.junit.Assert (CASSANDRA-14431)
- * cassandra-stress throws NPE if insert section isn't specified in user profile (CASSSANDRA-14426)
+ * Cassandra-stress throws NPE if insert section isn't specified in user profile (CASSSANDRA-14426)
  * List clients by protocol versions `nodetool clientstats --by-protocol` (CASSANDRA-14335)
  * Improve LatencyMetrics performance by reducing write path processing (CASSANDRA-14281)
  * Add network authz (CASSANDRA-13985)
diff --git a/doc/Dockerfile b/doc/Dockerfile
index 074a9ed6a0..dc4b50f47b 100644
--- a/doc/Dockerfile
+++ b/doc/Dockerfile
@@ -6,12 +6,15 @@ FROM python:2.7
 
 WORKDIR /usr/src/code
 
-RUN pip install sphinx sphinx_rtd_theme
+RUN pip install --no-cache-dir \
+        sphinx \
+        sphinx_rtd_theme
 
 RUN apt-get update \
     && apt-get install -y \
         ant \
-        default-jdk
+        default-jdk \
+    && apt-get clean
 
 CMD ant gen-doc \
     && echo "The locally built documentation can be found here:\n\n    build/html/index.html\n\n"