diff --git a/docs/core/api/client.md b/docs/core/api/client.md
index 7ec9f3b0331..ffbe308f948 100644
--- a/docs/core/api/client.md
+++ b/docs/core/api/client.md
@@ -268,10 +268,10 @@ agent.BodyStream(strings.NewReader("body=stream"), -1)
 
 ### JSON
 
-JSON sends a JSON request by setting the Content-Type header to `application/json`.
+JSON sends a JSON request by setting the Content-Type header to the `ctype` parameter. If no `ctype` is passed in, the header is set to `application/json`.
 
 ```go title="Signature"
-func (a *Agent) JSON(v interface{}) *Agent
+func (a *Agent) JSON(v interface{}, ctype ...string) *Agent
 ```
 
 ```go title="Example"
diff --git a/docs/core/api/ctx.md b/docs/core/api/ctx.md
index 7b195683dbb..2c3244926f0 100644
--- a/docs/core/api/ctx.md
+++ b/docs/core/api/ctx.md
@@ -797,7 +797,7 @@ app.Get("/", func(c *fiber.Ctx) error {
 Converts any **interface** or **string** to JSON using the [encoding/json](https://pkg.go.dev/encoding/json) package.
 
 :::info
-JSON also sets the content header to the `ctype` parameter. If no `ctype` is passed in, the header is set to **application/json**.
+JSON also sets the content header to the `ctype` parameter. If no `ctype` is passed in, the header is set to `application/json`.
 :::
 
 ```go title="Signature"