diff --git a/utilities/persistent_cache/persistent_cache_tier.h b/utilities/persistent_cache/persistent_cache_tier.h
index c42b7d5a985..6e1ebb2e7b4 100644
--- a/utilities/persistent_cache/persistent_cache_tier.h
+++ b/utilities/persistent_cache/persistent_cache_tier.h
@@ -160,7 +160,7 @@ struct PersistentCacheConfig {
   // Cache consists of multiples of small files. This parameter defines the
   // size of an individual cache file
   //
-  // default: 1M
+  // default: 100M
   uint32_t cache_file_size = 100ULL * 1024 * 1024;
 
   // writer-qdepth