diff --git a/src/callback.c b/src/callback.c
index 08cbfca2..c9dfb175 100644
--- a/src/callback.c
+++ b/src/callback.c
@@ -1,4 +1,4 @@
-/* file: callback.c
+/* File: callback.c
  *
  * This file is part of XSCHEM,
  * a schematic capture and Spice/Vhdl/Verilog netlisting tool for circuit