diff --git a/Advanced-settings.md b/Advanced-settings.md
index 4526b8f..74e323c 100644
--- a/Advanced-settings.md
+++ b/Advanced-settings.md
@@ -80,6 +80,8 @@ Default: `false`.
 
 If set to `true`, uBO will hard block all network requests when the browser launches until _all_ the filter lists and rules are loaded and ready, at which time uBO will force a reload of the tabs for which there were network requests blocked during the setup phase.
 
+Disclaimer: even with this setting enabled (set to `true`), it's impossible for uBO to guarantee with 100% certainty that everything will be properly blocked when the browser is launched. **This is a by-design browser issue** -- do _not_ open an issue on uBO issue tracker about this.
+
 ***
 
 #### `userResourcesLocation`