diff --git a/README.md b/README.md
index 50f93a7..515a9ec 100644
--- a/README.md
+++ b/README.md
@@ -28,8 +28,11 @@ heroku buildpacks:add --index 1 https://github.com/heroku/heroku-buildpack-apt
 
 #### Aptfile
 
+    # you can list packages
     libpq-dev
+    # or include links to specific .deb files
     http://downloads.sourceforge.net/project/wkhtmltopdf/0.12.1/wkhtmltox-0.12.1_linux-precise-amd64.deb
+    # or add custom apt repos
     :repo:deb http://cz.archive.ubuntu.com/ubuntu artful main universe
 
 #### Gemfile
diff --git a/bin/compile b/bin/compile
index 4c52f99..c3fd679 100755
--- a/bin/compile
+++ b/bin/compile
@@ -59,7 +59,7 @@ APT_OPTIONS="$APT_OPTIONS -o dir::etc::sourcelist=$APT_SOURCES"
 topic "Updating apt caches"
 apt-get $APT_OPTIONS update | indent
 
-for PACKAGE in $(cat $BUILD_DIR/Aptfile | grep -v -s -e "^:repo:"); do
+for PACKAGE in $(cat $BUILD_DIR/Aptfile | grep -v -s -e '^#' | grep -v -s -e "^:repo:"); do
   if [[ $PACKAGE == *deb ]]; then
     PACKAGE_NAME=$(basename $PACKAGE .deb)
     PACKAGE_FILE=$APT_CACHE_DIR/archives/$PACKAGE_NAME.deb
diff --git a/test/compile_test.sh b/test/compile_test.sh
index 03af44d..a742ab5 100644
--- a/test/compile_test.sh
+++ b/test/compile_test.sh
@@ -4,6 +4,7 @@
 
 testCompile() {
   cat > ${BUILD_DIR}/Aptfile <<EOF
+# Test comment
 s3cmd
 wget
 EOF