Document the --vcpus option to hspace

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@@ -33,6 +33,7 @@ Request options:
 .BI "[--memory " mem "]"
 .BI "[--disk " disk "]"
 .BI "[--req-nodes " req-nodes "]"
+.BI "[--vcpus " vcpus "]"
 
 
 .SH DESCRIPTION
@@ -176,6 +177,10 @@ The disk size of the instances to be placed (defaults to 100GiB).
 The number of nodes for the instances; the default of two means
 mirrored instances, while passing one means plain type instances.
 
+.TP
+.BI "--vcpus " vcpus
+The number of VCPUs of the instances to be placed (defaults to 1).
+
 .TP
 .BI "--max-cpu " cpu-ratio
 The maximum virtual-to-physical cpu ratio, as a floating point number