diff --git a/Package.swift b/Package.swift
index 7f11241..0a0c62a 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,11 +1,11 @@
-// swift-tools-version: 5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
     name: "Quilt",
-    platforms: [.iOS(.v14), .macOS(.v12), .watchOS(.v4)],
+    platforms: [.macOS(.v12)],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.
         .library(
diff --git a/Sources/Quilt/Array+safeIndex.swift b/Sources/Quilt/Array+safeIndex.swift
index 142e727..6fe9c55 100644
--- a/Sources/Quilt/Array+safeIndex.swift
+++ b/Sources/Quilt/Array+safeIndex.swift
@@ -1,10 +1,3 @@
-//
-//  Array+safeIndex.swift
-//
-//
-//  Created by Theodore Lampert on 08.12.22.
-//
-
 public extension Array {
     subscript(safeIndex index: Int) -> Element? {
         guard index >= 0, index < endIndex else {
diff --git a/Sources/Quilt/MarkType.swift b/Sources/Quilt/MarkType.swift
index 24c6929..ec266b2 100644
--- a/Sources/Quilt/MarkType.swift
+++ b/Sources/Quilt/MarkType.swift
@@ -1,10 +1,3 @@
-//
-//  MarkType.swift
-//
-//
-//  Created by Theodore Lampert on 15.12.22.
-//
-
 public enum MarkType: Codable, Equatable {
     case bold
     case italic
diff --git a/Sources/Quilt/NSAttributedString+Extensions.swift b/Sources/Quilt/NSAttributedString+Extensions.swift
index dc109b5..0552bc7 100644
--- a/Sources/Quilt/NSAttributedString+Extensions.swift
+++ b/Sources/Quilt/NSAttributedString+Extensions.swift
@@ -1,10 +1,3 @@
-//
-//  NSAttributedString+Extensions.swift
-//  
-//
-//  Created by Theodore Lampert on 15.05.23.
-//
-
 import Foundation
 
 public extension NSAttributedString {
diff --git a/Sources/Quilt/NSMutableAttributedString+Extensions.swift b/Sources/Quilt/NSMutableAttributedString+Extensions.swift
index 7a1db45..a373c9b 100644
--- a/Sources/Quilt/NSMutableAttributedString+Extensions.swift
+++ b/Sources/Quilt/NSMutableAttributedString+Extensions.swift
@@ -1,10 +1,3 @@
-//
-//  NSMutableAttributedString+setTextAttribute.swift
-//  
-//
-//  Created by Theodore Lampert on 15.05.23.
-//
-
 import Foundation
 
 public extension NSMutableAttributedString {
diff --git a/Sources/Quilt/OpID.swift b/Sources/Quilt/OpID.swift
index 318f3aa..5663bc9 100644
--- a/Sources/Quilt/OpID.swift
+++ b/Sources/Quilt/OpID.swift
@@ -1,10 +1,3 @@
-//
-//  OpID.swift
-//
-//
-//  Created by Theodore Lampert on 15.12.22.
-//
-
 import Foundation
 
 public struct OpID: Comparable, Hashable, Codable, Equatable, CustomStringConvertible {
diff --git a/Sources/Quilt/OpType.swift b/Sources/Quilt/OpType.swift
index c88f212..9eec9e3 100644
--- a/Sources/Quilt/OpType.swift
+++ b/Sources/Quilt/OpType.swift
@@ -1,10 +1,3 @@
-//
-//  OpType.swift
-//
-//
-//  Created by Theodore Lampert on 15.12.22.
-//
-
 public enum OpType: Codable, Equatable {
     case insert(String)
     case remove(OpID)
diff --git a/Sources/Quilt/Operation.swift b/Sources/Quilt/Operation.swift
index 858b00a..924205b 100644
--- a/Sources/Quilt/Operation.swift
+++ b/Sources/Quilt/Operation.swift
@@ -1,10 +1,3 @@
-//
-//  Operation.swift
-//
-//
-//  Created by Theodore Lampert on 15.12.22.
-//
-
 public struct Operation: Identifiable, Codable, Equatable {
     public var id: OpID { opId }
 
diff --git a/Sources/Quilt/Quilt.swift b/Sources/Quilt/Quilt.swift
index bbcce4b..872da89 100644
--- a/Sources/Quilt/Quilt.swift
+++ b/Sources/Quilt/Quilt.swift
@@ -1,5 +1,4 @@
 import Foundation
-import SwiftUI
 
 public struct Quilt: Codable {
     private var counter: Int = 0
@@ -18,6 +17,7 @@ public struct Quilt: Codable {
         /*
          Optimisation: Assume that text is inserted and removed sequentially
          and cache the last known index to avoid scanning the whole document.
+         This was cribbed from how Y.js does it.
          */
         var lastIdx: (OpID, Int)?
 
diff --git a/Sources/Quilt/QuiltString+Extensions.swift b/Sources/Quilt/QuiltString+Extensions.swift
index 01ab48d..9dca96f 100644
--- a/Sources/Quilt/QuiltString+Extensions.swift
+++ b/Sources/Quilt/QuiltString+Extensions.swift
@@ -1,10 +1,3 @@
-//
-//  QuiltString.swift
-//
-//
-//  Created by Theodore Lampert on 15.05.23.
-//
-
 import AppKit
 import Foundation
 
diff --git a/Sources/Quilt/QuiltString.swift b/Sources/Quilt/QuiltString.swift
index 8cb9040..a333e85 100644
--- a/Sources/Quilt/QuiltString.swift
+++ b/Sources/Quilt/QuiltString.swift
@@ -1,13 +1,4 @@
-//
-//  File.swift
-//
-//
-//  Created by Theodore Lampert on 15.12.22.
-//
-
-import AppKit
 import Foundation
-import SwiftUI
 
 public class QuiltString: ObservableObject {
     public init(
diff --git a/Sources/Quilt/SpanMarker.swift b/Sources/Quilt/SpanMarker.swift
index e4c87e8..1d8148a 100644
--- a/Sources/Quilt/SpanMarker.swift
+++ b/Sources/Quilt/SpanMarker.swift
@@ -1,10 +1,3 @@
-//
-//  SpanMarker.swift
-//
-//
-//  Created by Theodore Lampert on 15.12.22.
-//
-
 public enum SpanMarker: Codable, Equatable {
     case before(OpID)
     case after(OpID)