diff --git a/text_graph.js b/text_graph.js
index d5ac2bc..00ebaf6 100644
--- a/text_graph.js
+++ b/text_graph.js
@@ -63,10 +63,9 @@ class ASCIIBarChart {
      * @param {number} value - The numeric value to add
      */
     addValue(value) {
-
-        // Time bin mode: increment count in current active bin
+        // Time bin mode: add value to current active bin count
         this.checkBinRotation(); // Ensure we have an active bin
-        this.bins[this.currentBinIndex].count++;
+        this.bins[this.currentBinIndex].count += value;  // Changed from ++ to += value
         this.totalDataPoints++;
 
         this.render();