diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 944754644..af46e3c68 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -17,6 +17,10 @@
 |===
 | | Description | PR
 
+| 🐣
+| Removes unnecessary help message introduced for machine-readable outputs for commands which does not have -o url flag
+| https://github.com/knative/client/pull/1152[#1152]
+
 | 🐣
 | Improve error handling in clients
 | https://github.com/knative/client/pull/1154[#1154]
diff --git a/pkg/kn/commands/source/apiserver/describe.go b/pkg/kn/commands/source/apiserver/describe.go
index 52dfab188..331e4be3c 100644
--- a/pkg/kn/commands/source/apiserver/describe.go
+++ b/pkg/kn/commands/source/apiserver/describe.go
@@ -18,11 +18,10 @@ import (
 	"errors"
 	"fmt"
 	"sort"
-	"strings"
 
 	"github.com/spf13/cobra"
 	"k8s.io/cli-runtime/pkg/genericclioptions"
-	v1alpha2 "knative.dev/eventing/pkg/apis/sources/v1alpha2"
+	"knative.dev/eventing/pkg/apis/sources/v1alpha2"
 
 	"knative.dev/client/lib/printing"
 	"knative.dev/client/pkg/kn/commands"
@@ -114,7 +113,6 @@ func NewAPIServerDescribeCommand(p *commands.KnParams) *cobra.Command {
 	commands.AddNamespaceFlags(flags, false)
 	flags.BoolP("verbose", "v", false, "More output.")
 	machineReadablePrintFlags.AddFlags(command)
-	command.Flag("output").Usage = fmt.Sprintf("Output format. One of: %s.", strings.Join(machineReadablePrintFlags.AllowedFormats(), "|"))
 	return command
 }
 
diff --git a/pkg/kn/commands/source/ping/describe.go b/pkg/kn/commands/source/ping/describe.go
index d5d12d2a1..aa6229dbb 100644
--- a/pkg/kn/commands/source/ping/describe.go
+++ b/pkg/kn/commands/source/ping/describe.go
@@ -16,9 +16,7 @@ package ping
 
 import (
 	"errors"
-	"fmt"
 	"sort"
-	"strings"
 
 	"github.com/spf13/cobra"
 	"k8s.io/cli-runtime/pkg/genericclioptions"
@@ -113,7 +111,6 @@ func NewPingDescribeCommand(p *commands.KnParams) *cobra.Command {
 	commands.AddNamespaceFlags(flags, false)
 	flags.BoolP("verbose", "v", false, "More output.")
 	machineReadablePrintFlags.AddFlags(command)
-	command.Flag("output").Usage = fmt.Sprintf("Output format. One of: %s.", strings.Join(machineReadablePrintFlags.AllowedFormats(), "|"))
 	return command
 }
 
diff --git a/pkg/kn/commands/trigger/describe.go b/pkg/kn/commands/trigger/describe.go
index a607c6e0d..85c6c003d 100644
--- a/pkg/kn/commands/trigger/describe.go
+++ b/pkg/kn/commands/trigger/describe.go
@@ -16,18 +16,14 @@ package trigger
 
 import (
 	"errors"
-	"fmt"
-	"strings"
-
-	"k8s.io/cli-runtime/pkg/genericclioptions"
 
 	"github.com/spf13/cobra"
-
-	v1beta1 "knative.dev/eventing/pkg/apis/eventing/v1beta1"
+	"k8s.io/cli-runtime/pkg/genericclioptions"
 
 	"knative.dev/client/lib/printing"
 	"knative.dev/client/pkg/kn/commands"
 	"knative.dev/client/pkg/printers"
+	"knative.dev/eventing/pkg/apis/eventing/v1beta1"
 )
 
 var describeExample = `
@@ -114,7 +110,6 @@ func NewTriggerDescribeCommand(p *commands.KnParams) *cobra.Command {
 	commands.AddNamespaceFlags(flags, false)
 	flags.BoolP("verbose", "v", false, "More output.")
 	machineReadablePrintFlags.AddFlags(command)
-	command.Flag("output").Usage = fmt.Sprintf("Output format. One of: %s.", strings.Join(machineReadablePrintFlags.AllowedFormats(), "|"))
 	return command
 }