diff --git a/sonarr/naming.go b/sonarr/naming.go
index 5014f7e..5feedf9 100644
--- a/sonarr/naming.go
+++ b/sonarr/naming.go
@@ -22,21 +22,23 @@ const (
 	ColonReplaceWithSpaceDash
 	ColonReplaceWithSpaceDashSpace
 	ColonSmartReplace
+	Custom
 )
 
 // Naming represents the config/naming endpoint in Sonarr.
 type Naming struct {
-	RenameEpisodes           bool   `json:"renameEpisodes,omitempty"`
-	ReplaceIllegalCharacters bool   `json:"replaceIllegalCharacters,omitempty"`
-	ColonReplacementFormat   CRF    `json:"colonReplacementFormat,omitempty"`
-	ID                       int64  `json:"id,omitempty"`
-	MultiEpisodeStyle        int64  `json:"multiEpisodeStyle,omitempty"`
-	DailyEpisodeFormat       string `json:"dailyEpisodeFormat,omitempty"`
-	AnimeEpisodeFormat       string `json:"animeEpisodeFormat,omitempty"`
-	SeriesFolderFormat       string `json:"seriesFolderFormat,omitempty"`
-	SeasonFolderFormat       string `json:"seasonFolderFormat,omitempty"`
-	SpecialsFolderFormat     string `json:"specialsFolderFormat,omitempty"`
-	StandardEpisodeFormat    string `json:"standardEpisodeFormat,omitempty"`
+	RenameEpisodes               bool   `json:"renameEpisodes"`
+	ReplaceIllegalCharacters     bool   `json:"replaceIllegalCharacters"`
+	ColonReplacementFormat       CRF    `json:"colonReplacementFormat"`
+	ID                           int64  `json:"id"`
+	MultiEpisodeStyle            int64  `json:"multiEpisodeStyle"`
+	DailyEpisodeFormat           string `json:"dailyEpisodeFormat"`
+	AnimeEpisodeFormat           string `json:"animeEpisodeFormat"`
+	SeriesFolderFormat           string `json:"seriesFolderFormat"`
+	SeasonFolderFormat           string `json:"seasonFolderFormat"`
+	SpecialsFolderFormat         string `json:"specialsFolderFormat"`
+	StandardEpisodeFormat        string `json:"standardEpisodeFormat"`
+	CustomColonReplacementFormat string `json:"customColonReplacementFormat"`
 }
 
 // GetNaming returns the naming.
diff --git a/sonarr/naming_test.go b/sonarr/naming_test.go
index b3c317a..9b3e46e 100644
--- a/sonarr/naming_test.go
+++ b/sonarr/naming_test.go
@@ -23,6 +23,7 @@ const namingBody = `{
 	"seriesFolderFormat": "{Series Title}",
 	"seasonFolderFormat": "Season {season}",
 	"specialsFolderFormat": "Specials",
+	"customcolonReplacementFormat": "",
 	"id": 1
 }`
 
@@ -85,10 +86,23 @@ func TestUpdateNaming(t *testing.T) {
 			ExpectedMethod: "PUT",
 			ResponseStatus: 202,
 			WithRequest: &sonarr.Naming{
-				ReplaceIllegalCharacters: true,
+				RenameEpisodes:               true,
+				ReplaceIllegalCharacters:     true,
+				ColonReplacementFormat:       5,
+				ID:                           4,
+				MultiEpisodeStyle:            2,
+				DailyEpisodeFormat:           "a",
+				AnimeEpisodeFormat:           "b",
+				SeriesFolderFormat:           "c",
+				SeasonFolderFormat:           "d",
+				SpecialsFolderFormat:         "e",
+				StandardEpisodeFormat:        "f",
+				CustomColonReplacementFormat: "g",
 			},
-			ExpectedRequest: `{"replaceIllegalCharacters":true,"id":1}` + "\n",
-			ResponseBody:    namingBody,
+			ExpectedRequest: `{"renameEpisodes":true,"replaceIllegalCharacters":true,"colonReplacementFormat":5,` +
+				`"id":1,"multiEpisodeStyle":2,"dailyEpisodeFormat":"a","animeEpisodeFormat":"b","seriesFolderFormat":"c",` +
+				`"seasonFolderFormat":"d","specialsFolderFormat":"e","standardEpisodeFormat":"f","customColonReplacementFormat":"g"}` + "\n",
+			ResponseBody: namingBody,
 			WithResponse: &sonarr.Naming{
 				ID:                       1,
 				RenameEpisodes:           false,
@@ -103,6 +117,7 @@ func TestUpdateNaming(t *testing.T) {
 			},
 			WithError: nil,
 		},
+
 		{
 			Name:           "404",
 			ExpectedPath:   path.Join("/", starr.API, sonarr.APIver, "config", "naming"),
@@ -110,11 +125,13 @@ func TestUpdateNaming(t *testing.T) {
 			WithRequest: &sonarr.Naming{
 				ReplaceIllegalCharacters: true,
 			},
-			ExpectedRequest: `{"replaceIllegalCharacters":true,"id":1}` + "\n",
-			ResponseStatus:  404,
-			ResponseBody:    `{"message": "NotFound"}`,
-			WithError:       &starr.ReqError{Code: http.StatusNotFound},
-			WithResponse:    (*sonarr.Naming)(nil),
+			ExpectedRequest: `{"renameEpisodes":false,"replaceIllegalCharacters":true,"colonReplacementFormat":0,` +
+				`"id":1,"multiEpisodeStyle":0,"dailyEpisodeFormat":"","animeEpisodeFormat":"","seriesFolderFormat":"",` +
+				`"seasonFolderFormat":"","specialsFolderFormat":"","standardEpisodeFormat":"","customColonReplacementFormat":""}` + "\n",
+			ResponseStatus: 404,
+			ResponseBody:   `{"message": "NotFound"}`,
+			WithError:      &starr.ReqError{Code: http.StatusNotFound},
+			WithResponse:   (*sonarr.Naming)(nil),
 		},
 	}