diff --git a/docs/admin/federation-apiserver.md b/docs/admin/federation-apiserver.md
index 72d71547c7..9eb760d087 100644
--- a/docs/admin/federation-apiserver.md
+++ b/docs/admin/federation-apiserver.md
@@ -26,7 +26,7 @@ federation-apiserver
       --admission-control-config-file string                    File with admission control configuration.
       --advertise-address ip                                    The IP address on which to advertise the apiserver to members of the cluster. This address must be reachable by the rest of the cluster. If blank, the --bind-address will be used. If --bind-address is unspecified, the host's default interface will be used.
       --anonymous-auth                                          Enables anonymous requests to the secure port of the API server. Requests that are not rejected by another authentication method are treated as anonymous requests. Anonymous requests have a username of system:anonymous, and a group name of system:unauthenticated. (default true)
-      --apiserver-count int                                     The number of apiservers running in the cluster. (default 1)
+      --apiserver-count int                                     The number of apiservers running in the cluster. Must be a positive number. (default 1)
       --audit-log-maxage int                                    The maximum number of days to retain old audit log files based on the timestamp encoded in their filename.
       --audit-log-maxbackup int                                 The maximum number of old audit log files to retain.
       --audit-log-maxsize int                                   The maximum size in megabytes of the audit log file before it gets rotated. Defaults to 100MB.
diff --git a/docs/admin/kube-apiserver.md b/docs/admin/kube-apiserver.md
index bc08ef1f0a..1e2c8a602e 100644
--- a/docs/admin/kube-apiserver.md
+++ b/docs/admin/kube-apiserver.md
@@ -27,7 +27,7 @@ kube-apiserver
       --advertise-address ip                                    The IP address on which to advertise the apiserver to members of the cluster. This address must be reachable by the rest of the cluster. If blank, the --bind-address will be used. If --bind-address is unspecified, the host's default interface will be used.
       --allow-privileged                                        If true, allow privileged containers.
       --anonymous-auth                                          Enables anonymous requests to the secure port of the API server. Requests that are not rejected by another authentication method are treated as anonymous requests. Anonymous requests have a username of system:anonymous, and a group name of system:unauthenticated. (default true)
-      --apiserver-count int                                     The number of apiservers running in the cluster. (default 1)
+      --apiserver-count int                                     The number of apiservers running in the cluster. Must be a positive number. (default 1)
       --audit-log-maxage int                                    The maximum number of days to retain old audit log files based on the timestamp encoded in their filename.
       --audit-log-maxbackup int                                 The maximum number of old audit log files to retain.
       --audit-log-maxsize int                                   The maximum size in megabytes of the audit log file before it gets rotated. Defaults to 100MB.