diff --git a/README.markdown b/README.markdown
index db194c1..e7fb489 100644
--- a/README.markdown
+++ b/README.markdown
@@ -19,6 +19,9 @@ Then even your builds (where you can't specify links) will go fast.
     * default `main,universe`.
     * You may want `main,universe,restricted,multiverse`. Will use lots of
       disk.
+* `UBUNTU_MIRROR_PROJECTS`
+    * default `xenial,xenial-updates,xenial-security,xenial-backports`.
+    * You may want `xenial,xenial-updates,xenial-security,xenial-backports,trusty,trusty-updates,trusty-security,trusty-backports`
 * `UBUNTU_MIRROR_SOURCE`
     * default `archive.ubuntu.com`.
     * You may want `xx.archive.ubuntu.com` (where `xx` is your country
diff --git a/mirror/syncubuntu.sh b/mirror/syncubuntu.sh
index 21dc294..cc26ffd 100755
--- a/mirror/syncubuntu.sh
+++ b/mirror/syncubuntu.sh
@@ -16,13 +16,11 @@ debmirror \
 	--no-source \
 	-s ${MIRROR_CATEGORIES:-main,universe} \
 	-h ${UBUNTU_MIRROR_SOURCE:-archive.ubuntu.com} \
-	-d trusty,trusty-updates,trusty-security,trusty-backports \
-	-d xenial,xenial-updates,xenial-security,xenial-backports \
+	-d ${UBUNTU_MIRROR_PROJECTS:-xenial,xenial-updates,xenial-security,xenial-backports} \
     --ignore-small-errors \
 	-r /ubuntu \
 	--progress \
 	--method=http \
 	$DST/ubuntu
 
-
 chmod -R a+rX $DST