diff --git a/doc/makepanda/makepandacore.py b/doc/makepanda/makepandacore.py
index 06f6ebdcd9..6c88b13e26 100644
--- a/doc/makepanda/makepandacore.py
+++ b/doc/makepanda/makepandacore.py
@@ -35,6 +35,7 @@ MAXVERSIONINFO = [("MAX6", "SOFTWARE\\Autodesk\\3DSMAX\\6.0", "installdir", "max
                   ("MAX7", "SOFTWARE\\Autodesk\\3DSMAX\\7.0", "Installdir", "maxsdk\\include\\CS"),
                   ("MAX8", "SOFTWARE\\Autodesk\\3DSMAX\\8.0", "Installdir", "maxsdk\\include\\CS"),
                   ("MAX9", "SOFTWARE\\Autodesk\\3DSMAX\\9.0", "Installdir", "maxsdk\\include\\CS"),
+                  ("MAX2009", "SOFTWARE\\Autodesk\\3DSMAX\\9.0", "Installdir", "maxsdk\\include\\CS"),
 ]
 
 MAYAVERSIONS=[]