diff --git a/2016-04-02-apt-caching-for-debootstrap.html b/2016-04-02-apt-caching-for-debootstrap.html
index a7a896f..e069cc5 100644
--- a/2016-04-02-apt-caching-for-debootstrap.html
+++ b/2016-04-02-apt-caching-for-debootstrap.html
@@ -7,17 +7,20 @@
 
 <h3>Install apt-cacher-ng</h3>
 
-<code>sudo apt-get install squid-deb-proxy</code>
+<pre><code>sudo apt-get install squid-deb-proxy
+</code></pre>
 
 <h3>Tell programs to use the proxy</h3>
 
-<code>export http_proxy=http://127.0.0.1:8000
-# Note that you'll need to re-export this before any use of debootstrap</code>
+<pre><code>export http_proxy=http://127.0.0.1:8000
+# Note that you'll need to re-export this before any use of debootstrap
+</code></pre>
 
 <h3>Tell sudo to pass through http_proxy</h3>
 
-<code>sudo visudo
+<pre><code>sudo visudo
 # Add the line after the env_reset line:
-Defaults env_keep += "http_proxy"</code>
+Defaults env_keep += "http_proxy"
+</code></pre>
 
 <!--# include file="include/bottom.html" -->
diff --git a/markdown/2016-04-02-apt-caching-for-debootstrap.md b/markdown/2016-04-02-apt-caching-for-debootstrap.md
new file mode 100644
index 0000000..bd3884e
--- /dev/null
+++ b/markdown/2016-04-02-apt-caching-for-debootstrap.md
@@ -0,0 +1,23 @@
+<!--# set var="title" value="apt caching for debootstrap" -->
+<!--# set var="date" value="April 2, 2016" -->
+
+<!--# include file="include/top.html" -->
+
+If you’re building system images, you’re going to do a lot of debootstrap, which is going to fetch a lot of packages. On a fast system, that’ll be the slowest part of the process. Here’s how to cache.
+
+### Install apt-cacher-ng
+
+    sudo apt-get install squid-deb-proxy
+
+### Tell programs to use the proxy
+
+    export http_proxy=http://127.0.0.1:8000
+    # Note that you'll need to re-export this before any use of debootstrap
+
+### Tell sudo to pass through http_proxy
+
+    sudo visudo
+    # Add the line after the env_reset line:
+    Defaults env_keep += "http_proxy"
+
+<!--# include file="include/bottom.html" -->
diff --git a/markdown/build-html.sh b/markdown/build-html.sh
index 6177cd8..b52d3d3 100755
--- a/markdown/build-html.sh
+++ b/markdown/build-html.sh
@@ -6,7 +6,7 @@ for FILE in $BASEDIR/*.md; do
 	BASENAME=$(basename $FILE)
 	OUTNAME=${BASENAME%.md}.html
 	echo "$BASENAME -> $OUTNAME"
-	TEMP=$(tempfile --dir=$BASEDIR)
+	TEMP=$(tempfile --dir=$BASEDIR --mode=0644)
 	markdown $FILE > $TEMP
 	mv $TEMP $BASEDIR/../$OUTNAME
 done