diff --git a/docs/cmd/kn_source_ping_create.md b/docs/cmd/kn_source_ping_create.md
index 8c26e709a2..f2271191fb 100644
--- a/docs/cmd/kn_source_ping_create.md
+++ b/docs/cmd/kn_source_ping_create.md
@@ -7,7 +7,7 @@ Create a ping source
 Create a ping source
 
 ```
-kn source ping create NAME
+kn source ping create NAME --sink SINK
 ```
 
 ### Examples
diff --git a/pkg/kn/commands/source/ping/create.go b/pkg/kn/commands/source/ping/create.go
index b667d0d8a6..eca5296654 100644
--- a/pkg/kn/commands/source/ping/create.go
+++ b/pkg/kn/commands/source/ping/create.go
@@ -32,7 +32,7 @@ func NewPingCreateCommand(p *commands.KnParams) *cobra.Command {
 	var sinkFlags flags.SinkFlags
 
 	cmd := &cobra.Command{
-		Use:   "create NAME",
+		Use:   "create NAME --sink SINK",
 		Short: "Create a ping source",
 		Example: `
   # Create a Ping source 'my-ping' which fires every two minutes and sends '{ value: "hello" }' to service 'mysvc' as a cloudevent