diff --git a/README.md b/README.md
index bb67a41..7ddc59c 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,8 @@
 
 This will be a small firmware for an rp2040 microcontroller
 to read from a gas sensor and display the result on an
-oled display.
\ No newline at end of file
+oled display.
+
+# License
+
+CNPLv7+
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