diff --git a/CREDITS b/CREDITS
index 029e3b3..ca7a57b 100644
--- a/CREDITS
+++ b/CREDITS
@@ -34,3 +34,8 @@ FediBlock-backend makes direct use of the following libraries and programs:
     From: Daniel Stenberg and community
           https://curl.haxx.se/
     License: curl
+
+  ICU
+    From: The ICU project and community
+          http://site.icu-project.org/
+    License: BSD