diff --git a/pages/AshburnPoP.md b/pages/AshburnPoP.md
index 33c39da..6dca9cc 100644
--- a/pages/AshburnPoP.md
+++ b/pages/AshburnPoP.md
@@ -202,6 +202,8 @@ p2    DEVICE-ERROR   u0   2.73 TB   SATA  2   -            WDC WD3000FYYZ-01UL
 p3    OK             u0   2.73 TB   SATA  3   -            HITACHI HUA723030AL 
 ```
 
+Four drive bays seem to be numbered 0-3 left to right
+
 ### vm0.iad.rg.net Disk Drive Serial Numbers
 
 From `sudo smartctl -a -d 3ware,$i /dev/twl0`