diff --git a/conf/pika.conf b/conf/pika.conf
index 8eb29fbca6..80c4d753b3 100644
--- a/conf/pika.conf
+++ b/conf/pika.conf
@@ -113,7 +113,7 @@ compression : snappy
 max-background-flushes : 1
 # max-background-compactions: default is 2, limited in [1, 8]
 max-background-compactions : 2
-# max-cache-files default is 5000
+# maximum value of Rocksdb cached open file descriptors
 max-cache-files : 5000
 # max_bytes_for_level_multiplier: default is 10, you can change it to 5
 max-bytes-for-level-multiplier : 10