diff --git a/UPGRADE.md b/UPGRADE.md
index b048759d..ef6fd95a 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -42,6 +42,7 @@ Report your issue on Xibalba BBS, hop in #enigma-bbs on FreeNode and chat, or
 
 # 0.0.9-alpha to 0.0.10-alpha
 * Security related files such as private keys and certs are now looked for in `config/security` by default.
+* Default archive handler for zip files has switched to InfoZip due to a bug in the latest p7Zip packages causing "volume not found" errors. Ensure you have the InfoZip `zip` and `unzip` commands in ENiGMA's path. You can switch back to 7Zip by overriding `archiveHandler` for `application/zip` in your `config.hjson` under `fileTypes` to `7Zip`.
 
 # 0.0.8-alpha to 0.0.9-alpha
 * Development is now against Node.js 10.x LTS. Follow your standard upgrade path to update to Node 10.x before using 0.0.9-alpha!
diff --git a/WHATSNEW.md b/WHATSNEW.md
index fc6ed98f..293c9dc5 100644
--- a/WHATSNEW.md
+++ b/WHATSNEW.md
@@ -28,6 +28,7 @@ This document attempts to track **major** changes and additions in ENiGMA½. For
 }
 ```
 * `idleLogoutSeconds` and `preAuthIdleLogoutSeconds` can now be set to `0` to fully disable the idle monitor.
+* Switched default archive handler for zip files from 7zip to InfoZip (`zip` and `unzip`) commands. See [UPGRADE](UPGRADE.md).
 
 ## 0.0.9-alpha
 * Development is now against Node.js 10.x LTS. While other Node.js series may continue to work, you're own your own and YMMV!