diff --git a/docs/install.html b/docs/install.html
index f873b0cda..bf7f2ce07 100644
--- a/docs/install.html
+++ b/docs/install.html
@@ -20,7 +20,8 @@
 
     <h2>Install Python</h2>
 
-    <p>Follow the instructions on <a href="http://python.org/download/">the Python download page</a> to download and install Python v2.5.  (Python v2.4.2 or greater or Python v2.6 or greater should also work, although Tahoe isn't as well-tested on them as it is on Python v2.5.  Python v3 does not work.)
+    <p>Check if you already have an adequate version of Python installed by running <cite>python -V</cite>.  Python v2.5 is best.  Python v2.4.2 or greater or Python v2.6.0 or greater should also work, although Tahoe isn't as well-tested on them as it is on Python v2.5.  Python v3 does not work.
+    <p>If you don't have a proper version of Python installed, then follow the instructions on <a href="http://python.org/download/">the Python download page</a> to download and install Python v2.5.
 
     <h2>Get Tahoe</h2>