diff --git a/cli/documentation/en_US/host/host-address-space b/cli/documentation/en_US/host/host-address-space
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+++ b/cli/documentation/en_US/host/host-address-space
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+The optional address-space association for host allows the
+identified mac to be bound to a specific isolated address
+space. 
+
+When this optional parameter is not included, the mac
+is associated with the address-space named 'default'.