diff --git a/roles/postgresql/README.md b/roles/postgresql/README.md
index 223c240a..835ec3b0 100644
--- a/roles/postgresql/README.md
+++ b/roles/postgresql/README.md
@@ -3,6 +3,8 @@ Role Name
 
 Connects to a remote postgres server and uses provided admin credentials to create a new database and user account for a given application.
 
+Based on [the `postgresql` role from `pulibrary/princeton_ansible`](https://github.com/pulibrary/princeton_ansible/tree/main/roles/postgresql).
+
 Variables
 ---------
 
diff --git a/roles/postgresql/tasks/create_db.yml b/roles/postgresql/tasks/create_db.yml
index dfdcf423..0703d8a7 100644
--- a/roles/postgresql/tasks/create_db.yml
+++ b/roles/postgresql/tasks/create_db.yml
@@ -1,4 +1,7 @@
 ---
+# Based on:
+# https://github.com/pulibrary/princeton_ansible/blob/main/roles/postgresql/tasks/create_db.yml
+
 - name: ensure postgres database for app exists
   postgresql_db:
     name: "{{ application_db_name }}"
diff --git a/roles/postgresql/tasks/create_user.yml b/roles/postgresql/tasks/create_user.yml
index b3bb2de1..3ec2553a 100644
--- a/roles/postgresql/tasks/create_user.yml
+++ b/roles/postgresql/tasks/create_user.yml
@@ -1,4 +1,7 @@
 ---
+# Based on:
+# https://github.com/pulibrary/princeton_ansible/blob/main/roles/postgresql/tasks/create_users.yml
+
 - name: ensure postgres user account for app exists
   postgresql_user:
     name: "{{ application_dbuser_name }}"
diff --git a/roles/postgresql/tasks/main.yml b/roles/postgresql/tasks/main.yml
index 0c937fd7..1f0a53b3 100644
--- a/roles/postgresql/tasks/main.yml
+++ b/roles/postgresql/tasks/main.yml
@@ -1,5 +1,7 @@
 ---
-# tasks file for postgresql
+# Based on:
+# https://github.com/pulibrary/princeton_ansible/blob/main/roles/postgresql/tasks/main.yml
+
 - name: make sure the CA certificates are available
   become: true
   apt: