diff --git a/temp_throttle.sh b/temp_throttle.sh
index be0209f..3f02d9e 100755
--- a/temp_throttle.sh
+++ b/temp_throttle.sh
@@ -2,7 +2,7 @@
 
 # Usage: temp_throttle.sh max_temp
 # USE CELSIUS TEMPERATURES.
-# version 2.20
+# version 2.21
 
 cat << EOF
 Author: Sepero 2016 (sepero 111 @ gmx . com)