diff --git a/src/static/js/functions.js b/src/static/js/functions.js
index 9f444c8..5cdd973 100644
--- a/src/static/js/functions.js
+++ b/src/static/js/functions.js
@@ -387,7 +387,11 @@ function renderChart(data, filename, create_columns) {
                       data: data.map(d => d[value])
                     })
                 }
-                else if (value.toLowerCase().indexOf('pct') >= 0 | value.indexOf('percent') >= 0 | value.indexOf('deriv') >= 0) {
+                else if (value.toLowerCase().indexOf('pct') >= 0
+                    | value.toLowerCase().indexOf('diff') >= 0
+                    | value.indexOf('percent') >= 0
+                    | value.indexOf('deriv') >= 0)
+                {
                     series.push({
                       name: value,
                       type: 'line',