diff --git a/middleware/basic_auth.go b/middleware/basic_auth.go
index bf8e8bc3..be321fd5 100644
--- a/middleware/basic_auth.go
+++ b/middleware/basic_auth.go
@@ -17,7 +17,8 @@ type (
 		// Required.
 		Validator BasicAuthValidator
 
-		// Realm is a string to define realm attribute of BasicAuth
+		// Realm is a string to define realm attribute of BasicAuth.
+		// Default value "Restricted".
 		Realm string
 	}
 
@@ -87,7 +88,7 @@ func BasicAuthWithConfig(config BasicAuthConfig) echo.MiddlewareFunc {
 				}
 			}
 
-			var realm string
+			realm := ""
 			if config.Realm == defaultRealm {
 				realm = defaultRealm
 			} else {
diff --git a/website/content/middleware/basic-auth.md b/website/content/middleware/basic-auth.md
index e6379abc..bd853074 100644
--- a/website/content/middleware/basic-auth.md
+++ b/website/content/middleware/basic-auth.md
@@ -41,6 +41,10 @@ BasicAuthConfig struct {
   // Validator is a function to validate BasicAuth credentials.
   // Required.
   Validator BasicAuthValidator
+
+  // Realm is a string to define realm attribute of BasicAuth.
+  // Default value "Restricted".
+  Realm string
 }
 ```