diff --git a/Sources/TimecodeKitCore/API Evolution/TimecodeKitCore-API-2.3.1.swift b/Sources/TimecodeKitCore/API Evolution/TimecodeKitCore-API-2.3.1.swift
index f1aabb19..8ef69f8a 100644
--- a/Sources/TimecodeKitCore/API Evolution/TimecodeKitCore-API-2.3.1.swift	
+++ b/Sources/TimecodeKitCore/API Evolution/TimecodeKitCore-API-2.3.1.swift	
@@ -15,3 +15,8 @@ extension Timecode {
         stringValueVerbose
     }
 }
+
+extension Timecode.StringFormat {
+    @available(*, deprecated, message: "Use [.showSubFrames] instead.")
+    public static let showSubFrames: Self = [.showSubFrames]
+}
diff --git a/Sources/TimecodeKitCore/Timecode/StringFormat/StringFormat.swift b/Sources/TimecodeKitCore/Timecode/StringFormat/StringFormat.swift
index cd8acb93..fff73fe9 100644
--- a/Sources/TimecodeKitCore/Timecode/StringFormat/StringFormat.swift
+++ b/Sources/TimecodeKitCore/Timecode/StringFormat/StringFormat.swift
@@ -14,9 +14,6 @@ extension Timecode.StringFormat {
     public static func `default`() -> Self {
         []
     }
-    
-    /// Initialize with Show Subframes option enabled.
-    public static let showSubFrames: Self = [.showSubFrames]
 }
 
 extension Timecode.StringFormat {
diff --git a/Tests/TimecodeKitCoreTests/Timecode/Source/Timecode String Tests.swift b/Tests/TimecodeKitCoreTests/Timecode/Source/Timecode String Tests.swift
index 2fc26672..e21c810b 100644
--- a/Tests/TimecodeKitCoreTests/Timecode/Source/Timecode String Tests.swift	
+++ b/Tests/TimecodeKitCoreTests/Timecode/Source/Timecode String Tests.swift	
@@ -227,12 +227,12 @@ final class Timecode_Source_String_Tests: XCTestCase {
             let t = item.numberOfDigits == 2 ? "" : "0"
             
             // still produces days since we have not clamped it yet
-            var sv = tc.stringValue(format: .showSubFrames)
+            var sv = tc.stringValue(format: [.showSubFrames])
             XCTAssertEqual(sv, "2 01:02:03:\(t)04.12", "for \(item)")
             
             // now omits days since our limit is 24hr and clamped
             tc.clampComponents()
-            sv = tc.stringValue(format: .showSubFrames)
+            sv = tc.stringValue(format: [.showSubFrames])
             XCTAssertEqual(sv, "01:02:03:\(t)04.12", "for \(item)")
         }
         
@@ -245,12 +245,12 @@ final class Timecode_Source_String_Tests: XCTestCase {
             let t = item.numberOfDigits == 2 ? "" : "0"
             
             // still produces days since we have not clamped it yet
-            var sv = tc.stringValue(format: .showSubFrames)
+            var sv = tc.stringValue(format: [.showSubFrames])
             XCTAssertEqual(sv, "2 01:02:03;\(t)04.12", "for \(item)")
             
             // now omits days since our limit is 24hr and clamped
             tc.clampComponents()
-            sv = tc.stringValue(format: .showSubFrames)
+            sv = tc.stringValue(format: [.showSubFrames])
             XCTAssertEqual(sv, "01:02:03;\(t)04.12", "for \(item)")
         }
         
@@ -263,7 +263,7 @@ final class Timecode_Source_String_Tests: XCTestCase {
             
             let t = item.numberOfDigits == 2 ? "" : "0"
             
-            let sv = tc.stringValue(format: .showSubFrames)
+            let sv = tc.stringValue(format: [.showSubFrames])
             XCTAssertEqual(sv, "2 01:02:03:\(t)04.12", "for \(item)")
         }
         
@@ -274,7 +274,7 @@ final class Timecode_Source_String_Tests: XCTestCase {
             
             let t = item.numberOfDigits == 2 ? "" : "0"
             
-            let sv = tc.stringValue(format: .showSubFrames)
+            let sv = tc.stringValue(format: [.showSubFrames])
             XCTAssertEqual(sv, "2 01:02:03;\(t)04.12", "for \(item)")
         }
     }
diff --git a/Tests/TimecodeKitCoreTests/Timecode/Timecode init Tests.swift b/Tests/TimecodeKitCoreTests/Timecode/Timecode init Tests.swift
index adbad494..f1f50b49 100644
--- a/Tests/TimecodeKitCoreTests/Timecode/Timecode init Tests.swift	
+++ b/Tests/TimecodeKitCoreTests/Timecode/Timecode init Tests.swift	
@@ -48,7 +48,7 @@ final class Timecode_init_Tests: XCTestCase {
             
             let frSep = item.isDrop ? ";" : ":"
             
-            XCTAssertEqual(tc.stringValue(format: .showSubFrames), "00:00:00\(frSep)\(frm).00")
+            XCTAssertEqual(tc.stringValue(format: [.showSubFrames]), "00:00:00\(frSep)\(frm).00")
         }
     }
 }