diff --git a/BookBar.js b/BookBar.js
index 652e5af..9217e17 100644
--- a/BookBar.js
+++ b/BookBar.js
@@ -41,8 +41,22 @@ class ProgressBar {
         && (val <= this.max_progress)
         && (val != this.current_progress)) {
       this.current_progress = val;
-    this.anim_progress = 0;
+      this.anim_progress = 0;
     } else {
+      if (Number.isInteger(val)
+          && (val >= this.max_progress)
+          && (val != this.current_progress)) {
+        this.current_progress = this.max_progress;
+        this.anim_progress = 0;
+        console.warn("Progress update: Goal Exceeded.")
+      }
+      if (Number.isInteger(val)
+          && (val <= 0)
+          && (val != this.current_progress)) {
+        this.current_progress = 0;
+        this.anim_progress = 0;
+        console.warn("Progress update: Goal Subceeded.")
+      }
       console.warn("Progress update failed.")
     }
   }