diff --git a/Doc/README.txt b/Doc/README.txt
index c719cdaa6d1..ebeb358bc2e 100644
--- a/Doc/README.txt
+++ b/Doc/README.txt
@@ -14,7 +14,7 @@ those familiar with the previous docs written in LaTeX.
 Building the docs
 =================
 
-You need to install Python 2.5 or higher; the toolset used to build the docs are
+You need to install Python 2.4 or higher; the toolset used to build the docs are
 written in Python.  The toolset used to build the documentation is called
 *Sphinx*, it is not included in this tree, but maintained separately in the
 Python Subversion repository.  Also needed are Jinja, a templating engine