diff --git a/README.md b/README.md
index d371a2d..3e164e9 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,7 @@ Users
 OpenPGP.php is currently being used in the following projects:
 
 * <https://wordpress.org/plugins/wp-pgp-encrypted-emails/>
+* [Passbolt API](https://github.com/passbolt/passbolt_api)
 
 Download
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