diff --git a/docs/_includes/generated/rocks_db_configurable_configuration.html b/docs/_includes/generated/rocks_db_configurable_configuration.html
index b4f514e879599..eb35fb7de5f21 100644
--- a/docs/_includes/generated/rocks_db_configurable_configuration.html
+++ b/docs/_includes/generated/rocks_db_configurable_configuration.html
@@ -72,7 +72,7 @@
             <td><h5>state.backend.rocksdb.writebuffer.size</h5></td>
             <td style="word-wrap: break-word;">(none)</td>
             <td>String</td>
-            <td>The amount of data built up in memory (backed by an unsorted log on disk) before converting to a sorted on-disk files. RocksDB has default writebuffer size as '4MB'.</td>
+            <td>The amount of data built up in memory (backed by an unsorted log on disk) before converting to a sorted on-disk files. RocksDB has default writebuffer size as '64MB'.</td>
         </tr>
     </tbody>
 </table>
diff --git a/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBConfigurableOptions.java b/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBConfigurableOptions.java
index 261e5f020b816..a8213bcb54cc6 100644
--- a/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBConfigurableOptions.java
+++ b/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBConfigurableOptions.java
@@ -94,7 +94,7 @@ public class RocksDBConfigurableOptions implements Serializable {
 		key("state.backend.rocksdb.writebuffer.size")
 			.noDefaultValue()
 			.withDescription("The amount of data built up in memory (backed by an unsorted log on disk) " +
-				"before converting to a sorted on-disk files. RocksDB has default writebuffer size as '4MB'.");
+				"before converting to a sorted on-disk files. RocksDB has default writebuffer size as '64MB'.");
 
 	public static final ConfigOption<String> MAX_WRITE_BUFFER_NUMBER =
 		key("state.backend.rocksdb.writebuffer.count")