diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -10,6 +10,8 @@ The supported syntax is restricted to th
 * `()` - parentheses, grouping several tokens together. For example `a|b*` matches a single `a` or any number of `b`s. `(a|b)*` matches any string of `a`s and `b`s
 * Symbols not listed above are used as they are. There is no escaping, so matching for the operator literals is not possible.
 
+Licensed under GNU GPLv3 or newer.
+
 ## Usage
 The python code supports Python 3.9 and higher. The rust code is written for Rust edition 2021.