diff --git a/docs/security.md b/docs/security.md
index 7fb3e17de94c..0247b2a47e16 100644
--- a/docs/security.md
+++ b/docs/security.md
@@ -81,6 +81,15 @@ The following table describes the different options available for configuring th
     algorithms supported by the javax.crypto.SecretKeyFactory class in the JRE being used.
   </td>
 </tr>
+<tr>
+  <td><code>spark.network.crypto.keyFactoryIterations</code></td>
+  <td>1024</td>
+  <td>
+    The number of iterations to run when generating keys. The default value was picked for speed,
+    assuming that a secret has good entropy. Should be used maximum number of iterations which have
+    negligible impact on the system.
+  </td>
+</tr>
 <tr>
   <td><code>spark.network.crypto.config.*</code></td>
   <td>None</td>