diff --git a/rsync_ui.sh b/rsync_ui.sh
index 0205a5a..c6bf2b6 100755
--- a/rsync_ui.sh
+++ b/rsync_ui.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -e
+set -e  # error out when one of the commands in the script errors.
 
 # macOS does not support readlink -f, so we use greadlink instead
 if [[ `uname` == 'Darwin' ]]; then