diff --git a/docs/configuration.md b/docs/configuration.md
index d99092e3c506e1b9818c0c1a63a4957254d122c5..154a3aee6855abd627aa92a0ec44af18e14fcfeb 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -884,7 +884,7 @@ Apart from these, the following properties are also available, and may be useful
   <td><code>spark.akka.frameSize</code></td>
   <td>128</td>
   <td>
-    Maximum message size to allow in "control plane" communication; generally only applies to map
+    Maximum message size (in MB) to allow in "control plane" communication; generally only applies to map
     output size information sent between executors and the driver. Increase this if you are running
     jobs with many thousands of map and reduce tasks and see messages about the frame size.
   </td>