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diff --git a/docs/configuration.md b/docs/configuration.md
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--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -559,6 +559,29 @@ Apart from these, the following properties are also available, and may be useful
<code>spark.io.compression.codec</code>.
</td>
</tr>
+<tr>
+ <td><code>spark.io.encryption.enabled</code></td>
+ <td>false</td>
+ <td>
+ Enable IO encryption. Only supported in YARN mode.
+ </td>
+</tr>
+<tr>
+ <td><code>spark.io.encryption.keySizeBits</code></td>
+ <td>128</td>
+ <td>
+ IO encryption key size in bits. Supported values are 128, 192 and 256.
+ </td>
+</tr>
+<tr>
+ <td><code>spark.io.encryption.keygen.algorithm</code></td>
+ <td>HmacSHA1</td>
+ <td>
+ The algorithm to use when generating the IO encryption key. The supported algorithms are
+ described in the KeyGenerator section of the Java Cryptography Architecture Standard Algorithm
+ Name Documentation.
+ </td>
+</tr>
</table>
#### Spark UI