diff --git a/CHANGELOG b/CHANGELOG
index 61eced8f3..598eff9fb 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Integrated zipdownload plugin to download all attachments (#1445509)
 - Fix HTML special characters handling in message list/header display (#1488523)
 - List related text/html part as attachment in plain text mode (#1488677)
 - Use IMAP BINARY (RFC3516) extension to fetch message/part bodies
diff --git a/INSTALL b/INSTALL
index f6d305ae5..30217686b 100644
--- a/INSTALL
+++ b/INSTALL
@@ -13,7 +13,7 @@ REQUIREMENTS
 * .htaccess support allowing overrides for DirectoryIndex
 * PHP Version 5.2.1 or greater including
    - PDO, PCRE, DOM, JSON, XML, Session, Sockets (required)
-   - libiconv (recommended)
+   - libiconv, zip (recommended)
    - mbstring, fileinfo, mcrypt (optional)
 * PEAR packages distributed with Roundcube or external:
    - Mail_Mime 1.8.1 or newer