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diff --git a/README.md b/README.md
index 8f95e50..ef43499 100644
--- a/README.md
+++ b/README.md
@@ -56,3 +56,22 @@ ignore this.
 | de-SN | Saxony                          |
 | de-ST | Saxony-Anhalt                   |
 | de-TH | Thuringia                       |
+
+#### Austria
+
+The official ISO-3166 codes are just AT-1 through AT-9, in alphabetical order
+of the states. So in this case, we use pseudo codes to make it easier for
+timewarrior users to identify their state.
+
+|  ISO  | State               | Official ISO |
+| :---: | ------------------- | ------------ |
+| at-BL | Burgenland          | AT-1         |
+| at-KT | Carinthia (Kärnten) | AT-2         |
+| at-NO | Lower Austria       | AT-3         |
+| at-OO | Upper Austria       | AT-4         |
+| at-SZ | Salzburg            | AT-5         |
+| at-ST | Styria (Steiermark) | AT-6         |
+| at-TI | Tyrol               | AT-7         |
+| at-VA | Vorarlberg          | AT-8         |
+| at-VI | Vienna (Wien)       | AT-9         |
+