fix some comments
diff --git a/tools/warm_apts_and_pips.sh b/tools/warm_apts_and_pips.sh
index b20519f..10bd4af 100755
--- a/tools/warm_apts_and_pips.sh
+++ b/tools/warm_apts_and_pips.sh
@@ -1,16 +1,16 @@
#!/usr/bin/env bash
-# echo commands
+# Echo commands
set -o xtrace
-# exit on error to stop unexpected errors
+# Exit on error to stop unexpected errors
set -o errexit
# Keep track of the current directory
TOOLS_DIR=$(cd $(dirname "$0") && pwd)
TOP_DIR=`cd $TOOLS_DIR/..; pwd`
-# cd to top of devstack
+# Change dir to top of devstack
cd $TOP_DIR
# Echo usage