diff --git a/source/core/sharded-cluster-internals.txt b/source/core/sharded-cluster-internals.txt
index 6de8bed9294..b5101141fcd 100644
--- a/source/core/sharded-cluster-internals.txt
+++ b/source/core/sharded-cluster-internals.txt
@@ -430,7 +430,7 @@ Greater than 80    8
 
 Once a balancing round starts, the balancer will not stop until the
 difference between the number of chunks on any two shards is *less
-than two.*
+than two* or a chunk migration fails.
 
 .. note::