diff --git a/update-integrity.sh b/update-integrity.sh
index 7e1e0ef..0bd9e93 100755
--- a/update-integrity.sh
+++ b/update-integrity.sh
@@ -10,14 +10,19 @@
 
 # check if user gave path to a PKGBUILD,
 # or a directory that contains it.
+
+# no args; check cwd
 if [ "$#" -eq 0 ]; then
     input="$PWD"
+# otherwise, use arg
 else
     input="$1"
 fi
+# if input is a dir, check for PKGBUILD
 if [ -d "$input" ]; then
     input="$input/PKGBUILD"
 fi
+# validate; is there a PKGBUILD?
 if [ "$(basename "$input")" != "PKGBUILD" ] || [ ! -f "$input" ]; then
     echo "PKGBUILD not found!"
     exit 1