diff --git a/display_api/copyright.txt b/display_api/copyright.txt
index e3a15e9..02b8467 100644
--- a/display_api/copyright.txt
+++ b/display_api/copyright.txt
@@ -2,3 +2,5 @@ Code by Pierre-Yves Rollo (pyrollo)
 Contributors:
 (gpcf): Compatibility with signs lib
 (Thomas--S): Fix /clearobjects bug
+(12Me21): on_place improvement and code style fixing
+