diff --git a/ChangeLog b/ChangeLog
index 6d5ba9888..614f104b0 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,6 +8,8 @@ $Source$
 2006-04-21 Michal Čihař  <michal@cihar.com>
     * libraries/import/csv.php: Fix importing files without trailing new line
       (bug #1473944).
+    * Documentation.html: Document problems with PMA_blowfish on clusters of
+      different architectures (bug #1470912).
 
 2006-04-20 Michal Čihař  <michal@cihar.com>
     * index.php: Check target against goto_whitelist.
diff --git a/Documentation.html b/Documentation.html
index 37114e23a..e41e693da 100755
--- a/Documentation.html
+++ b/Documentation.html
@@ -2347,6 +2347,15 @@ ALTER TABLE `pma_column_comments`
     Please refers to the <a href="http://www.fpdf.org/">FPDF manual</a> to build
     these files.</p>
 
+<h4 id="faq1_20">
+    <a href="#faq1_20">I run phpMyAdmin on cluster of different machines and
+    password encryption in cookie auth doesn't work.</a></h4>
+
+<p> If your cluster consist of different architectures, PHP code used for
+    encryption/decryption won't work correct. This is caused by use of
+    pack/unpack functions in code. Only solution is to use mcrypt extension
+    which works fine in this case.</p>
+
 <h4 id="faqmysql">
     <a href="#faqmysql">I receive the error &quot;cannot load MySQL extension, please
     check PHP Configuration&quot;.</a></h4>