diff --git a/port-authority-nsw/README.md b/port-authority-nsw/README.md
new file mode 100644
index 0000000..f1bfaaf
--- /dev/null
+++ b/port-authority-nsw/README.md
@@ -0,0 +1,31 @@
+# pansw_tide.py
+
+Download latest time series data from Port Authority of NSW and update local copy.
+
+MHL keeps records for the previous seven days.
+
+## Station locations
+
+| ID | Description                               |
+|----|-------------------------------------------|
+| 02 |  Offshore (Directional) Wave              |
+| 03 |  Bombora (Directional) Wave               |
+| 04 |  Captain Cook Channel (SG) Wave           |
+| 05 |  Kurnell (SG) Wave                        |
+| 06 |  Molineaux Point Wind                     |
+| 07 |  Sydney Airport (Main Runway BOM) Wind    |
+| 08 |  Brotherson Emergency Response Jetty Tide |
+| 09 |  Caltex (Directional) Current             |
+| 12 |  Western Wedding Cake Wind                |
+| 13 |  Fort Denison (Sth end BOM) Wind          |
+| 14 |  Overseas Passenger Terminal Wind         |
+| 15 |  Glebe Island Wind                        |
+| 16 |  Fort Denison-Primary (Nth end) Tide      |
+| 17 |  Fort Denison-Secondary (Vegapuls64) Tide |
+| 18 |  Circular Quay ADCP Current               |
+| 19 |  Balls Head Current                       |
+| 22 |  Twofold Bay - Munganno Point Wave        |
+| 23 |  Twofold Bay - Multipurpose Wharf Wind    |
+| 24 |  Breakwater Wharf Wind                    |
+| 27 |  Middle Wall (Vegapulse WL61) Tide        |
+| 28 |  Goodwood (Vegapulse WL61) Tide           |