diff --git a/InstallDetails.md b/InstallDetails.md
index 3b74e13..94aebdf 100644
--- a/InstallDetails.md
+++ b/InstallDetails.md
@@ -123,10 +123,11 @@ and `/usr/bin/tahoe` .
 
 The "`make install`" 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`" and 
-"`make install PREFIX=/usr/local`" to work the same way as traditional unix
+checking that setuptools does. This allows "`make install`"  to work the same way as traditional unix
 software (via GNU autoconf, etc).
 
+("`make install PREFIX=/usr/local`" does not currently work -- see #703.)
+
 TODO: There should be some way to use "`setup.py easy_install`" to install
 Tahoe **and** its dependencies into the system somewhere, but I haven't
 been able to figure out how.
@@ -164,5 +165,4 @@ Macintosh OS-X executable and the corresponding installer (.dmg) file.
 Tahoe is primarily developed on Debian/Ubuntu machines. You can either build
 from source (as described by this page), or download pre-compiled debian
 packages for several distributions. See the DownloadDebianPackages page for
-details.
-
+details.
\ No newline at end of file