diff --git a/models/http_error_rule.go b/models/http_error_rule.go
index 6c69c731..f84dedd9 100644
--- a/models/http_error_rule.go
+++ b/models/http_error_rule.go
@@ -50,7 +50,7 @@ type HTTPErrorRule struct {
 	ReturnContent string `json:"return_content,omitempty"`
 
 	// return content format
-	// Enum: [default-errorfile errorfile errorfiles file lf-file string lf-string]
+	// Enum: [default-errorfiles errorfile errorfiles file lf-file string lf-string]
 	ReturnContentFormat string `json:"return_content_format,omitempty"`
 
 	// return content type
@@ -136,7 +136,7 @@ var httpErrorRuleTypeReturnContentFormatPropEnum []interface{}
 
 func init() {
 	var res []string
-	if err := json.Unmarshal([]byte(`["default-errorfile","errorfile","errorfiles","file","lf-file","string","lf-string"]`), &res); err != nil {
+	if err := json.Unmarshal([]byte(`["default-errorfiles","errorfile","errorfiles","file","lf-file","string","lf-string"]`), &res); err != nil {
 		panic(err)
 	}
 	for _, v := range res {
@@ -146,8 +146,8 @@ func init() {
 
 const (
 
-	// HTTPErrorRuleReturnContentFormatDefaultDashErrorfile captures enum value "default-errorfile"
-	HTTPErrorRuleReturnContentFormatDefaultDashErrorfile string = "default-errorfile"
+	// HTTPErrorRuleReturnContentFormatDefaultDashErrorfiles captures enum value "default-errorfiles"
+	HTTPErrorRuleReturnContentFormatDefaultDashErrorfiles string = "default-errorfiles"
 
 	// HTTPErrorRuleReturnContentFormatErrorfile captures enum value "errorfile"
 	HTTPErrorRuleReturnContentFormatErrorfile string = "errorfile"
diff --git a/models/http_request_rule.go b/models/http_request_rule.go
index cadcbb01..988da4c3 100644
--- a/models/http_request_rule.go
+++ b/models/http_request_rule.go
@@ -199,7 +199,7 @@ type HTTPRequestRule struct {
 	ReturnContent string `json:"return_content,omitempty"`
 
 	// return content format
-	// Enum: [default-errorfile errorfile errorfiles file lf-file string lf-string]
+	// Enum: [default-errorfiles errorfile errorfiles file lf-file string lf-string]
 	ReturnContentFormat string `json:"return_content_format,omitempty"`
 
 	// return content type
@@ -1027,7 +1027,7 @@ var httpRequestRuleTypeReturnContentFormatPropEnum []interface{}
 
 func init() {
 	var res []string
-	if err := json.Unmarshal([]byte(`["default-errorfile","errorfile","errorfiles","file","lf-file","string","lf-string"]`), &res); err != nil {
+	if err := json.Unmarshal([]byte(`["default-errorfiles","errorfile","errorfiles","file","lf-file","string","lf-string"]`), &res); err != nil {
 		panic(err)
 	}
 	for _, v := range res {
@@ -1037,8 +1037,8 @@ func init() {
 
 const (
 
-	// HTTPRequestRuleReturnContentFormatDefaultDashErrorfile captures enum value "default-errorfile"
-	HTTPRequestRuleReturnContentFormatDefaultDashErrorfile string = "default-errorfile"
+	// HTTPRequestRuleReturnContentFormatDefaultDashErrorfiles captures enum value "default-errorfiles"
+	HTTPRequestRuleReturnContentFormatDefaultDashErrorfiles string = "default-errorfiles"
 
 	// HTTPRequestRuleReturnContentFormatErrorfile captures enum value "errorfile"
 	HTTPRequestRuleReturnContentFormatErrorfile string = "errorfile"
diff --git a/models/http_response_rule.go b/models/http_response_rule.go
index 87c93f6a..7b9ec52f 100644
--- a/models/http_response_rule.go
+++ b/models/http_response_rule.go
@@ -149,7 +149,7 @@ type HTTPResponseRule struct {
 	ReturnContent string `json:"return_content,omitempty"`
 
 	// return content format
-	// Enum: [default-errorfile errorfile errorfiles file lf-file string lf-string]
+	// Enum: [default-errorfiles errorfile errorfiles file lf-file string lf-string]
 	ReturnContentFormat string `json:"return_content_format,omitempty"`
 
 	// return content type
@@ -763,7 +763,7 @@ var httpResponseRuleTypeReturnContentFormatPropEnum []interface{}
 
 func init() {
 	var res []string
-	if err := json.Unmarshal([]byte(`["default-errorfile","errorfile","errorfiles","file","lf-file","string","lf-string"]`), &res); err != nil {
+	if err := json.Unmarshal([]byte(`["default-errorfiles","errorfile","errorfiles","file","lf-file","string","lf-string"]`), &res); err != nil {
 		panic(err)
 	}
 	for _, v := range res {
@@ -773,8 +773,8 @@ func init() {
 
 const (
 
-	// HTTPResponseRuleReturnContentFormatDefaultDashErrorfile captures enum value "default-errorfile"
-	HTTPResponseRuleReturnContentFormatDefaultDashErrorfile string = "default-errorfile"
+	// HTTPResponseRuleReturnContentFormatDefaultDashErrorfiles captures enum value "default-errorfiles"
+	HTTPResponseRuleReturnContentFormatDefaultDashErrorfiles string = "default-errorfiles"
 
 	// HTTPResponseRuleReturnContentFormatErrorfile captures enum value "errorfile"
 	HTTPResponseRuleReturnContentFormatErrorfile string = "errorfile"
diff --git a/specification/build/haproxy_spec.yaml b/specification/build/haproxy_spec.yaml
index f174a8c4..ae7d89b7 100644
--- a/specification/build/haproxy_spec.yaml
+++ b/specification/build/haproxy_spec.yaml
@@ -3865,7 +3865,7 @@ definitions:
                           - lf-string
           return_content_format:
               enum:
-                  - default-errorfile
+                  - default-errorfiles
                   - errorfile
                   - errorfiles
                   - file
@@ -4432,7 +4432,7 @@ definitions:
                           - lf-string
           return_content_format:
               enum:
-                  - default-errorfile
+                  - default-errorfiles
                   - errorfile
                   - errorfiles
                   - file
@@ -4856,7 +4856,7 @@ definitions:
                           - lf-string
           return_content_format:
               enum:
-                  - default-errorfile
+                  - default-errorfiles
                   - errorfile
                   - errorfiles
                   - file
diff --git a/specification/models/configuration/http/error.yaml b/specification/models/configuration/http/error.yaml
index ae6fc4cc..cb14fc88 100644
--- a/specification/models/configuration/http/error.yaml
+++ b/specification/models/configuration/http/error.yaml
@@ -33,7 +33,7 @@ http_error_rule:
       x-nullable: true
     return_content_format:
       type: string
-      enum: [default-errorfile, errorfile, errorfiles, file, lf-file, string, lf-string]
+      enum: [default-errorfiles, errorfile, errorfiles, file, lf-file, string, lf-string]
       x-dependency:
         type:
           value: status
diff --git a/specification/models/configuration/http/request.yaml b/specification/models/configuration/http/request.yaml
index 48cf2c27..471aee37 100644
--- a/specification/models/configuration/http/request.yaml
+++ b/specification/models/configuration/http/request.yaml
@@ -523,7 +523,7 @@ http_request_rule:
       x-nullable: true
     return_content_format:
       type: string
-      enum: [default-errorfile, errorfile, errorfiles, file, lf-file, string, lf-string]
+      enum: [default-errorfiles, errorfile, errorfiles, file, lf-file, string, lf-string]
       x-dependency:
         type:
           value: [deny, tarpit, return]
diff --git a/specification/models/configuration/http/response.yaml b/specification/models/configuration/http/response.yaml
index 7b91dae9..1c049a96 100644
--- a/specification/models/configuration/http/response.yaml
+++ b/specification/models/configuration/http/response.yaml
@@ -369,7 +369,7 @@ http_response_rule:
       x-nullable: true
     return_content_format:
       type: string
-      enum: [default-errorfile, errorfile, errorfiles, file, lf-file, string, lf-string]
+      enum: [default-errorfiles, errorfile, errorfiles, file, lf-file, string, lf-string]
       x-dependency:
         type:
           value: [deny, return]