diff --git a/AdvancedInstall.md b/AdvancedInstall.md
index c7b7101..59ec550 100644
--- a/AdvancedInstall.md
+++ b/AdvancedInstall.md
@@ -173,8 +173,11 @@ and `/usr/bin/tahoe` .
 
 The "`make install`" Makefile target is a wrapper around "`setup.py install`"
 that uses `--single-version-externally-managed` to bypass the extra
-checking that setuptools does. This allows "`make install`"  to work the same way as traditional unix
-software (via GNU autoconf, etc).
+checking that setuptools does. This allows "`make install`"  to work
+somewhat more like traditional Unix software. However, once Tahoe has been
+installed this way, it may be difficult to get it to stop using the installed
+version even when using `bin/tahoe` from a different build directory;
+see #1258.
 
 ("`make install PREFIX=/usr/local`" does not currently work -- see #703.)