diff --git a/html/include/config.php b/html/include/config.php
index 9c968b4..fa8c1cc 100644
--- a/html/include/config.php
+++ b/html/include/config.php
@@ -5,9 +5,11 @@ error_reporting(E_ALL & ~E_NOTICE);
 
 
 // Name of the monitored Dashboard
-
 define("REPORT_NAME","Dashboard of local DMR network");
 
+// Height of Server Activity window: 20px; 1 row, 40px 2 rows, 60px 3 rows
+define("HEIGHT_ACTIVITY","40px");
+
 //
 // Theme colors define
 //
@@ -36,4 +38,4 @@ define("THEME_COLOR","background-image: linear-gradient(to bottom, #337ab7 0%, #
 //define("THEME_COLOR","background-image:linear-gradient(to bottom right,#d0e98d, #4e6b00);color:black;");
 //
 
-?>
\ No newline at end of file
+?>