diff --git a/scripts/games/app.js b/scripts/games/app.js
index 1d1d721..889c727 100644
--- a/scripts/games/app.js
+++ b/scripts/games/app.js
@@ -179,15 +179,15 @@ function processGame(game) {
       model.testcase_date = "2000-01-01";
     } else {
       let recent = model.testcases[0];
-      // The displayed compatibility rating is an weighted arithmetic mean of the submitted ratings.
+      // The displayed compatibility rating is a weighted arithmetic mean of the submitted ratings.
       let numerator = 0;
       let denominator = 0;
       model.testcases.forEach(testcase => {
         // Build date is a better metric but testcases from the TOML files only have a submission date.
         let weigh_date = new Date(testcase.buildDate == undefined ? testcase.date : testcase.buildDate);
         // The test case is weighted on an exponential decay curve such that a test case is half as relevant as each month (30 days) passes.
-        // The exponent is obtained by dividing the time in millisecond between the current date and date of testing by the number of milliseconds in 30 days (but negative because it's a decay).
-        let weight = Math.pow(.5, (currentDate - weigh_date) / -(30 * 1000 * 3600 * 24));
+        // The exponent is obtained by dividing the time in millisecond between the current date and date of testing by the number of milliseconds in 30 days.
+        let weight = Math.pow(.5, (currentDate - weigh_date) / (30 * 1000 * 3600 * 24));
         numerator += testcase.compatibility * weight;
         denominator += weight;
       });