diff --git a/load_balancing.md b/load_balancing.md
index 78fa8f246..be532daef 100644
--- a/load_balancing.md
+++ b/load_balancing.md
@@ -4,10 +4,16 @@ Load balancing is feature coming for the end of 2015. The goal here is to **dist
 
 Because Xen Orchestra is connected to [multiple pools](xo-server.md) and XenServer supports [live storage motion](https://www.citrix.com/content/dam/citrix/en_us/documents/products-solutions/storage-xenmotion-live-storage-migration-with-citrix-xenserver.pdf?accessmode=direct), we can imagine load balancing on a **whole XenServer infrastructure** (even between remote Data Centers).
 
-## Challenges
+## First challenges
 
 We are already capable to gather the metrics from all the hosts and VMs. But we need now to:
 
 * analyze the global load
 * detect bottlenecks
-* act accordingly
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+* compare to user limits
+* act accordingly
+
+There is also a lof of unknown parameters:
+
+* a live storage motion could be very long on remote DC if your bandwidth is low
+* avoid to made worse than no load balancing (this is easier than you think!)
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