diff --git a/README.md b/README.md
index 054e36ec6..6eb88561f 100644
--- a/README.md
+++ b/README.md
@@ -417,6 +417,7 @@ When a short string in your documentation is insufficient, or you need images, c
 | description.markdown  | A short description of the application. Parsed from the api.md file. This is an alternative to @description    |// @description.markdown No value needed, this parses the description from api.md         																 |
 | tag.name    | Name of a tag.| // @tag.name This is the name of the tag                     |
 | tag.description.markdown   | Description of the tag this is an alternative to tag.description. The description will be read from a file named like tagname.md  | // @tag.description.markdown         |
+| tag.x-name  | The extension key, must be start by x- and take only string value | // @x-example-key value |
 
 
 ## API Operation
diff --git a/parser.go b/parser.go
index 561c4549e..5aa74e024 100644
--- a/parser.go
+++ b/parser.go
@@ -673,6 +673,21 @@ func parseGeneralAPIInfo(parser *Parser, comments []string) error {
 
 					parser.swagger.Extensions[attribute[1:]] = valueJSON
 				}
+			} else if strings.HasPrefix(attribute, "@tag.x-") {
+				extensionName := attribute[5:]
+
+				if len(value) == 0 {
+					return fmt.Errorf("annotation %s need a value", attribute)
+				}
+
+				if tag.Extensions == nil {
+					tag.Extensions = make(map[string]interface{})
+				}
+
+				// tag.Extensions.Add(extensionName, value) works wrong (transforms extensionName to lower case)
+				// needed to save case for ReDoc
+				// https://redocly.com/docs/api-reference-docs/specification-extensions/x-display-name/
+				tag.Extensions[extensionName] = value
 			}
 		}
 
diff --git a/parser_test.go b/parser_test.go
index 7862796d1..7dc5e482f 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -576,7 +576,8 @@ func TestParser_ParseGeneralAPITagDocs(t *testing.T) {
 		"@tag.name test",
 		"@tag.description A test Tag",
 		"@tag.docs.url https://example.com",
-		"@tag.docs.description Best example documentation"})
+		"@tag.docs.description Best example documentation",
+		"@tag.x-displayName Test group"})
 	assert.NoError(t, err)
 
 	b, _ := json.MarshalIndent(parser.GetSwagger().Tags, "", "    ")
@@ -587,7 +588,8 @@ func TestParser_ParseGeneralAPITagDocs(t *testing.T) {
         "externalDocs": {
             "description": "Best example documentation",
             "url": "https://example.com"
-        }
+        },
+        "x-displayName": "Test group"
     }
 ]`
 	assert.Equal(t, expected, string(b))