diff --git a/AdvancedInstall.md b/AdvancedInstall.md
index dc7ba88..30bd4d3 100644
--- a/AdvancedInstall.md
+++ b/AdvancedInstall.md
@@ -242,6 +242,11 @@ on Python's `sys.path`.
 To run a subset of the tests after making a source change that does not require
 a rebuild, `bin/tahoe debug trial <testsuite>` is the quickest option.
 
+To test an OS package manager's installation of Tahoe, use `tahoe debug trial`,
+where `tahoe` (not `bin/tahoe`) is the installed script. Currently this
+will produce a spurious failure in `allmydata.test.test_runner.BinTahoe.test_the_right_code`
+due to #1576, but all other tests should be valid.
+
 
 <a name="point9"></a>
 ## Platform-specific Notes