diff --git a/INSTALL b/INSTALL
index b060bc284..b64a9a857 100644
--- a/INSTALL
+++ b/INSTALL
@@ -13,12 +13,12 @@ Other dependencies include:
 3. libpng
 4. libjpeg
 5. freetype2
-6. postgresql (+postgis)
+6. postgresql (+postgis) - if you want to build postgis datasource
 
 Building
 Once you satisfy all dependencies you can build mapnik by issuing the following  command:
 
-:/> scons DATASOURCES=postgis PREFIX=/where/to/install install
+:/> scons DATASOURCES=all PREFIX=/where/to/install install
 
 This should compile, link and install all relevant libraries/headers in PREFIX.