diff --git a/src/rateLimiter.ts b/src/rateLimiter.ts
index 6c5213b..e27de58 100644
--- a/src/rateLimiter.ts
+++ b/src/rateLimiter.ts
@@ -64,8 +64,6 @@ export class RateLimiter {
 
     /**
      * Refill tokens based on elapsed time.
-     *
-     * BUG: Does not cap at maxTokens, allowing unbounded accumulation.
      */
     refill(): void {
         const now = Date.now();
@@ -76,8 +74,10 @@ export class RateLimiter {
         }
 
         const intervals = Math.floor(elapsed / this.refillInterval);
-        // BUG: no cap at maxTokens
-        this.tokens += intervals * this.refillRate;
+        const tokensToAdd = intervals * this.refillRate;
+        
+        // Cap tokens at maxTokens to prevent unbounded accumulation
+        this.tokens = Math.min(this.tokens + tokensToAdd, this.maxTokens);
 
         this.lastRefillTime += intervals * this.refillInterval;
     }