diff --git a/core/src/main/scala/org/apache/spark/internal/config/package.scala b/core/src/main/scala/org/apache/spark/internal/config/package.scala
index 7527f2ef677c5..652db2bdf90a9 100644
--- a/core/src/main/scala/org/apache/spark/internal/config/package.scala
+++ b/core/src/main/scala/org/apache/spark/internal/config/package.scala
@@ -191,15 +191,15 @@ package object config {
 
   private[spark] val EVENT_LOG_ENABLE_ROLLING =
     ConfigBuilder("spark.eventLog.rolling.enabled")
-      .doc("Whether rolling over event log files is enabled.  If set to true, it cuts down " +
+      .doc("Whether rolling over event log files is enabled. If set to true, it cuts down " +
         "each event log file to the configured size.")
       .booleanConf
       .createWithDefault(false)
 
   private[spark] val EVENT_LOG_ROLLING_MAX_FILE_SIZE =
     ConfigBuilder("spark.eventLog.rolling.maxFileSize")
-      .doc(s"Precondition: ${EVENT_LOG_ENABLE_ROLLING.key}. " +
-        "The max size of event log file to be rolled over.")
+      .doc(s"When ${EVENT_LOG_ENABLE_ROLLING.key}=true, specifies the max size of event log file" +
+        " to be rolled over.")
       .bytesConf(ByteUnit.BYTE)
       .checkValue(_ >= ByteUnit.MiB.toBytes(10), "Max file size of event log should be " +
         "configured to be at least 10 MiB.")
diff --git a/docs/configuration.md b/docs/configuration.md
index 1343755f9d87f..6f7d5f5447df7 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -1033,7 +1033,7 @@ Apart from these, the following properties are also available, and may be useful
   <td><code>spark.eventLog.rolling.maxFileSize</code></td>
   <td>128m</td>
   <td>
-    The max size of event log file before it's rolled over.
+    When <code>spark.eventLog.rolling.enabled=true</code>, specifies the max size of event log file before it's rolled over.
   </td>
 </tr>
 <tr>