diff --git a/README.md b/README.md
index e010d53..1d92c9b 100644
--- a/README.md
+++ b/README.md
@@ -29,4 +29,19 @@
 
 # Notes
 
-- PLC Version 28
\ No newline at end of file
+- PLC Version 28
+
+
+
+# Security
+## Default Username/ Passwords
+
+| Group         | Username          | Password            |
+|-------------- |------------------ |-------------------- |
+| Operator      | op                | op1234              |
+| Maintenance   | maint             | maint4321           |
+| Engineer      | engr              | 3ng1n33r            |
+| Administrator | admin             | Adm1n?911           |
+| Administrator | HenryPump         | < I'll never tell > |
+
+It is highly recommended to change the default passwords.