diff --git a/buildout/README-2.12.txt b/buildout/README-2.12.txt
index 029d660d04e6fd6dc64f12e28d525d83b857df94..ff4e5461bc7eed1c5fd118c5d43d04da926406dd 100644
--- a/buildout/README-2.12.txt
+++ b/buildout/README-2.12.txt
@@ -91,7 +91,8 @@ Please refer to the 'helpers' directory for other distributions.
 Instances
 =========
 
-Note: Instance generation is still a work in progress.
+Note: Instance generation is still a work in progress. In particular, these
+instructions should be much simplified.
 
 After the software components are built, we can generate ERP5 instance
 buildouts from that software.
diff --git a/buildout/software-profiles/erp5-2.12.cfg b/buildout/software-profiles/erp5-2.12.cfg
index 024ca209d821ae0f2e57247b35c93cc380b37ff4..019c820790c8a773c96cb011a6ae5d9a2d5f0b3b 100644
--- a/buildout/software-profiles/erp5-2.12.cfg
+++ b/buildout/software-profiles/erp5-2.12.cfg
@@ -38,7 +38,7 @@ destination = ${itools:source}
 [itools-build]
 recipe = collective.recipe.cmd
 on_install = True
-on_update = False
+on_update = True
 # reference itools-download:destination instead of itools:source to trigger its
 # execution
 cmds =