diff --git a/snap-pac b/snap-pac
index 9575991..b526467 100755
--- a/snap-pac
+++ b/snap-pac
@@ -24,7 +24,12 @@
 set -e
 
 if [[ $EUID -ne 0 ]]; then
-    echo "snap-pac must be run as root." 
+    echo "snap-pac must be sourced as root." 
+    exit
+fi
+
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    echo "This script is intended to be sourced from a pacman hook and not run on its own."
     exit
 fi