diff --git a/INSTALL b/INSTALL
index 51b55148d3..6af6565053 100644
--- a/INSTALL
+++ b/INSTALL
@@ -85,7 +85,7 @@ The two following programs should be available at configuration time:
 
   o Python 2.3 or newer installed to be able to import older LyX files
     with the lyx2lyx script (this script is called automatically when
-    opening a file).
+    opening a file). Python 3.0 or later is not supported.
 
 
 Creating the Makefile
diff --git a/README b/README
index de437f7f66..8439a02f36 100644
--- a/README
+++ b/README
@@ -40,6 +40,7 @@ What do I need to run LyX?
     Note 2: Python 2.4.0 or later is required for the clean_dvi.py script,
     which, however, is only used on Windows, where at least Python 2.6.0
     is anyway recommended.
+    Note 3: Python 3.0 or later is not supported.
 
 How does the LyX version scheme work?
 
@@ -95,8 +96,8 @@ What do I need to compile LyX from the source distribution?
       gcc/g++, but some others work also. As of LyX 1.6.0, you need at
       least gcc 3.2.x.
 
-    * The Qt4 library, at least version 4.2.0. For all features
-      newer versions (e.g. Qt 4.5) are recommended.
+    * The Qt4 library, at least version 4.4.0. For all features
+      newer versions (e.g. Qt 4.6) are recommended.
 
     Read the file "INSTALL" for more information on compiling.