Merge pull request #77900 from SataQiu/fix-issue-1513

cmd/kubeadm/app/apis/kubeadm/validation/validation.go

@@ -146,7 +146,7 @@ func ValidateDiscoveryBootstrapToken(b *kubeadm.BootstrapTokenDiscovery, fldPath
 	}
 
 	if len(b.CACertHashes) == 0 && !b.UnsafeSkipCAVerification {
-		allErrs = append(allErrs, field.Invalid(fldPath, "", "using token-based discovery without caCertHashes can be unsafe. Set unsafeSkipCAVerification to continue"))
+		allErrs = append(allErrs, field.Invalid(fldPath, "", "using token-based discovery without caCertHashes can be unsafe. Set unsafeSkipCAVerification as true in your kubeadm config file or pass --discovery-token-unsafe-skip-ca-verification flag to continue"))
 	}
 
 	allErrs = append(allErrs, ValidateToken(b.Token, fldPath.Child(kubeadmcmdoptions.TokenStr))...)