diff --git a/openerp/tools/config.py b/openerp/tools/config.py
index e80b58ed998..ad8f5c73b4b 100644
--- a/openerp/tools/config.py
+++ b/openerp/tools/config.py
@@ -283,10 +283,10 @@ class configmanager(object):
                          help="Specify the number of workers, 0 disable prefork mode.",
                          type="int")
         group.add_option("--limit-memory-soft", dest="limit_memory_soft", my_default=640 * 1024 * 1024,
-                         help="Maximum allowed virtual memory per worker, when reached the worker be reset after the current request (default 640M).",
+                         help="Maximum allowed virtual memory per worker, when reached the worker be reset after the current request (default 671088640 aka 640MB).",
                          type="int")
         group.add_option("--limit-memory-hard", dest="limit_memory_hard", my_default=768 * 1024 * 1024,
-                         help="Maximum allowed virtual memory per worker, when reached, any memory allocation will fail (default 768M).",
+                         help="Maximum allowed virtual memory per worker, when reached, any memory allocation will fail (default 805306368 aka 768MB).",
                          type="int")
         group.add_option("--limit-time-cpu", dest="limit_time_cpu", my_default=60,
                          help="Maximum allowed CPU time per request (default 60).",