Make it more clear

Author: haochengxia

libCacheSim/cache/eviction/S3FIFO.c

@@ -265,10 +265,10 @@ static cache_obj_t *S3FIFO_insert(cache_t *cache, const request_t *req) {
     obj = main_fifo->insert(main_fifo, req);
   } else {
     /* insert into small fifo */
-    // NOTE: Inserting an object whose size equals the entire cache size is NOT
-    // allowed. Doing so would completely fill the cache, causing all existing
-    // objects to be evicted. This scenario can occur frequently and is
-    // undesirable.
+    // NOTE: Inserting an object whose size equals the size of small fifo is
+    // NOT allowed. Doing so would completely fill the cache, causing all
+    // existing objects to be evicted. This scenario can occur frequently and
+    // is undesirable.
     if (req->obj_size >= small_fifo->cache_size) {
       return NULL;
     }