diff --git a/index.html b/index.html
index 4ad1c2f1..2049366b 100644
--- a/index.html
+++ b/index.html
@@ -810,6 +810,9 @@ This is a collection of privacy related about:config tweaks. We
dom.battery.enabled = false
- Website owners can track the battery status of your device. Source
+
+browser.sessionstore.max_tabs_undo = 0
+- Even with FireFox set to not remember history, your closed tabs are stored temporarily in the History button found at Menu -> History -> Recently Closed Tabs
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