Add URL with info for PIL.
diff --git a/Modules/Setup.dist b/Modules/Setup.dist
index d4be06b..f715efd 100644
--- a/Modules/Setup.dist
+++ b/Modules/Setup.dist
@@ -290,6 +290,7 @@
# *** Uncomment and edit for BLT extension only:
# -DWITH_BLT -I/usr/local/blt/blt8.0-unoff/include -lBLT8.0 \
# *** Uncomment and edit for PIL (TkImaging) extension only:
+# (See http://www.pythonware.com/products/pil/ for more info)
# -DWITH_PIL -I../Extensions/Imaging/libImaging tkImaging.c \
# *** Uncomment and edit for TOGL extension only:
# -DWITH_TOGL togl.c \