diff --git a/scripts/setup/postgres-init-db b/scripts/setup/postgres-init-db
index 409f604529..a874ac6ec2 100755
--- a/scripts/setup/postgres-init-db
+++ b/scripts/setup/postgres-init-db
@@ -30,7 +30,8 @@ if [ -e "/var/run/supervisor.sock" ]; then
 fi
 
 # Drop any open connections to any old database.  Hackishly call using
-# source because postgres user can't read /root/zulip/scripts/setup.
+# `source`, because postgres user may not be able to read this directory
+# if unpacked by root.
 source "$(dirname "$0")/terminate-psql-sessions" postgres zulip zulip_base
 
 (