diff --git a/README.md b/README.md
index 33c5615..33e03f8 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,8 @@
 * If just latitude and longitude are provided, the timestamp is calculated automatically for this moment.
 * If first- and last name of a person are provided, their birth-location coordinates and birth-time should be the geospatial arguments
 
+The GeoTemporal Sigilizer uses the principle of classic magical sigil creation with kameas / magic squares and applies it to the fractal grid that underlies [Open Location Codes](https://github.com/google/open-location-code)
+
 ## Installation
 
 ```