diff --git a/Sources/OpenSwiftUI/App/Commands/Commands.swift b/Sources/OpenSwiftUI/App/Commands/Commands.swift
index 568e47e2c..4ba6e8350 100644
--- a/Sources/OpenSwiftUI/App/Commands/Commands.swift
+++ b/Sources/OpenSwiftUI/App/Commands/Commands.swift
@@ -70,6 +70,7 @@ public protocol Commands {
         inputs: _CommandsInputs
     ) -> _CommandsOutputs
 
+    /// A function that applies `self`'s changes to the given menu.
     func _resolve(into resolved: inout _ResolvedCommands)
 }
 
diff --git a/Sources/OpenSwiftUI/Test/PerformanceTest.swift b/Sources/OpenSwiftUI/Test/PerformanceTest.swift
index 7bf3ab43c..0e62ead38 100644
--- a/Sources/OpenSwiftUI/Test/PerformanceTest.swift
+++ b/Sources/OpenSwiftUI/Test/PerformanceTest.swift
@@ -13,6 +13,7 @@ import OpenSwiftUI_SPI
 
 // MARK: - _PerformanceTest [6.4.41]
 
+/// A performance test that will be executed by PPT.
 @available(OpenSwiftUI_v1_0, *)
 public protocol _PerformanceTest: _Test {
     var name: String { get }
@@ -28,6 +29,9 @@ extension __App {
 
 @available(OpenSwiftUI_v1_0, *)
 extension _BenchmarkHost {
+    /// Notifies the `_BenchmarkHost` when you started a test
+    ///
+    /// - Parameter test: The test that was started
     public func _started(test: _PerformanceTest) {
         #if os(iOS) || os(visionOS)
         UIApplication.shared.startedTest(test.name)
@@ -37,6 +41,9 @@ extension _BenchmarkHost {
         #endif
     }
 
+    /// Notify the `_BenchmarkHost` when you finished a test
+    ///
+    /// - Parameter test: The test that was finished
     public func _finished(test: _PerformanceTest) {
         #if os(iOS) || os(visionOS)
         UIApplication.shared.finishedTest(test.name)
@@ -46,6 +53,9 @@ extension _BenchmarkHost {
         #endif
     }
 
+    /// Notify the `_BenchmarkHost` when you failed a test
+    ///
+    /// - Parameter test: The test that failed
     public func _failed(test: _PerformanceTest) {
         #if os(iOS) || os(visionOS)
         UIApplication.shared.failedTest(test.name, withFailure: nil)
diff --git a/Sources/OpenSwiftUICore/Animation/Animation/AnimationModifier.swift b/Sources/OpenSwiftUICore/Animation/Animation/AnimationModifier.swift
index 4a2e9dbf7..aa5d80995 100644
--- a/Sources/OpenSwiftUICore/Animation/Animation/AnimationModifier.swift
+++ b/Sources/OpenSwiftUICore/Animation/Animation/AnimationModifier.swift
@@ -11,6 +11,7 @@ import OpenCoreGraphicsShims
 
 // MARK: - _AnimationModifier
 
+/// Concrete modifier type to apply an animation to the child view.
 @available(OpenSwiftUI_v1_0, *)
 @frozen
 public struct _AnimationModifier<Value>: ViewModifier, PrimitiveViewModifier where Value: Equatable {
diff --git a/Sources/OpenSwiftUICore/Animation/Transaction/Transaction.swift b/Sources/OpenSwiftUICore/Animation/Transaction/Transaction.swift
index 5566526c2..ad4077d97 100644
--- a/Sources/OpenSwiftUICore/Animation/Transaction/Transaction.swift
+++ b/Sources/OpenSwiftUICore/Animation/Transaction/Transaction.swift
@@ -60,6 +60,7 @@ public protocol TransactionKey {
     /// The default value for the transaction key.
     static var defaultValue: Value { get }
 
+    /// Returns true if `lhs` and `rhs` are equal.
     static func _valuesEqual(_ lhs: Value, _ rhs: Value) -> Swift.Bool
 }
 
diff --git a/Sources/OpenSwiftUICore/Graphic/Color/ColorMatrix.swift b/Sources/OpenSwiftUICore/Graphic/Color/ColorMatrix.swift
index 8c446c48a..97554bfd6 100644
--- a/Sources/OpenSwiftUICore/Graphic/Color/ColorMatrix.swift
+++ b/Sources/OpenSwiftUICore/Graphic/Color/ColorMatrix.swift
@@ -36,6 +36,10 @@ public struct ColorMatrix: Equatable {
 
 // MARK: - _ColorMatrix
 
+/// A color matrix. The result of applying to a color is produced by
+/// multiplying the color by the square matrix formed by the first
+/// columns of the color matrix, then adding the last column to the
+/// result.
 @frozen
 public struct _ColorMatrix: Equatable, Codable {
     public var m11: Float = 1, m12: Float = 0, m13: Float = 0, m14: Float = 0, m15: Float = 0
diff --git a/Sources/OpenSwiftUICore/Layout/Layout.swift b/Sources/OpenSwiftUICore/Layout/Layout.swift
index aa1247418..f26d05a1f 100644
--- a/Sources/OpenSwiftUICore/Layout/Layout.swift
+++ b/Sources/OpenSwiftUICore/Layout/Layout.swift
@@ -1527,6 +1527,7 @@ public struct LayoutSubview: Equatable {
 
     let containerLayoutDirection: LayoutDirection
 
+    /// Returns the trait value `K` associated with the subview.
     public func _trait<K>(key: K.Type) -> K.Value where K: _ViewTraitKey {
         proxy[key]
     }
diff --git a/Sources/OpenSwiftUICore/Layout/SafeAreaIgnoringLayout.swift b/Sources/OpenSwiftUICore/Layout/SafeAreaIgnoringLayout.swift
index 8a4c893b2..92affacc3 100644
--- a/Sources/OpenSwiftUICore/Layout/SafeAreaIgnoringLayout.swift
+++ b/Sources/OpenSwiftUICore/Layout/SafeAreaIgnoringLayout.swift
@@ -8,6 +8,8 @@
 import OpenAttributeGraphShims
 package import OpenCoreGraphicsShims
 
+/// A UnaryLayout which insets its child by the inverse of the safe area
+/// on the specified edges.
 @available(OpenSwiftUI_v1_0, *)
 @frozen
 public struct _SafeAreaIgnoringLayout: UnaryLayout {
@@ -49,6 +51,8 @@ public struct _SafeAreaIgnoringLayout: UnaryLayout {
 
 // MARK: - _SafeAreaRegionsIgnoringLayout
 
+/// A UnaryLayout which insets its child by the inverse of the safe area
+/// on the specified edges.
 @available(OpenSwiftUI_v2_0, *)
 @frozen
 public struct _SafeAreaRegionsIgnoringLayout: UnaryLayout {
diff --git a/Sources/OpenSwiftUICore/Modifier/ViewModifier/EnvironmentalModifier.swift b/Sources/OpenSwiftUICore/Modifier/ViewModifier/EnvironmentalModifier.swift
index 53edbec88..077d13014 100644
--- a/Sources/OpenSwiftUICore/Modifier/ViewModifier/EnvironmentalModifier.swift
+++ b/Sources/OpenSwiftUICore/Modifier/ViewModifier/EnvironmentalModifier.swift
@@ -23,6 +23,11 @@ public protocol EnvironmentalModifier: ViewModifier where Body == Never {
     @available(OpenSwiftUI_v3_0, *)
     static var _requiresMainThread: Bool { get }
     
+    /// Flag to indicate whether this modifier tracks the values that are used
+    /// in the environment.
+    ///
+    /// The default is `true`. Override and return `false` for special cases
+    /// where this is undesirable.
     @available(OpenSwiftUI_v5_0, *)
     static var _tracksEnvironmentDependencies: Bool { get }
 }
diff --git a/Sources/OpenSwiftUICore/Render/RendererEffect/RendererEffect.swift b/Sources/OpenSwiftUICore/Render/RendererEffect/RendererEffect.swift
index d25e5a2da..9f713efe0 100644
--- a/Sources/OpenSwiftUICore/Render/RendererEffect/RendererEffect.swift
+++ b/Sources/OpenSwiftUICore/Render/RendererEffect/RendererEffect.swift
@@ -244,6 +244,9 @@ extension GraphicsBlendMode: RendererEffect {
 
 // MARK: - GeometryGroupEffect
 
+/// An effect that isolates the translational component of the frame
+/// rects of all content in the child view from changes in the parent
+/// view.
 @available(OpenSwiftUI_v5_0, *)
 @frozen
 public struct _GeometryGroupEffect: RendererEffect, Equatable {
diff --git a/Sources/OpenSwiftUICore/Shape/ShapeStyle/ShapeStyleShape.swift b/Sources/OpenSwiftUICore/Shape/ShapeStyle/ShapeStyleShape.swift
index 259144579..c214e10c7 100644
--- a/Sources/OpenSwiftUICore/Shape/ShapeStyle/ShapeStyleShape.swift
+++ b/Sources/OpenSwiftUICore/Shape/ShapeStyle/ShapeStyleShape.swift
@@ -9,6 +9,7 @@ package import Foundation
 
 // MARK: - _ShapeStyle_Shape
 
+/// A shape that can have a ShapeStyle value applied to it.
 @available(OpenSwiftUI_v3_0, *)
 public struct _ShapeStyle_Shape {
     package enum Operation {
diff --git a/Sources/OpenSwiftUICore/Test/Benchmark.swift b/Sources/OpenSwiftUICore/Test/Benchmark.swift
index 7baf09cc4..dafc1f1a1 100644
--- a/Sources/OpenSwiftUICore/Test/Benchmark.swift
+++ b/Sources/OpenSwiftUICore/Test/Benchmark.swift
@@ -21,6 +21,13 @@ public protocol _BenchmarkHost: AnyObject {
     @available(OpenSwiftUI_v3_0, *)
     func _renderAsyncForTest(interval: Double) -> Bool
 
+    /// Performs a scrolling test.
+    ///
+    /// - Parameter startOffset: the content offset to start the test from.
+    /// - Parameter iterations: the number of iterations to repeat the test.
+    /// - Parameter delta: the delta in points that the test should move each
+    /// tick of the display.
+    /// - Parameter length: the total length of each iteration in points.
     func _performScrollTest(startOffset: CGFloat, iterations: Int, delta: CGFloat, length: CGFloat, completion: (() -> Void)?)
 }
 
diff --git a/Sources/OpenSwiftUICore/View/Image/NamedImage.swift b/Sources/OpenSwiftUICore/View/Image/NamedImage.swift
index 6f851dd1d..c131ad6c3 100644
--- a/Sources/OpenSwiftUICore/View/Image/NamedImage.swift
+++ b/Sources/OpenSwiftUICore/View/Image/NamedImage.swift
@@ -609,6 +609,7 @@ package enum NamedImage {
 
 @available(OpenSwiftUI_v1_0, *)
 extension Image {
+    /// A way to specify where to load "main bundle" images from.
     public static var _mainNamedBundle: Bundle? { nil }
 }
 
diff --git a/Sources/OpenSwiftUICore/View/Text/Font/ModifiedFont.swift b/Sources/OpenSwiftUICore/View/Text/Font/ModifiedFont.swift
index 11047c4fb..d01e2b173 100644
--- a/Sources/OpenSwiftUICore/View/Text/Font/ModifiedFont.swift
+++ b/Sources/OpenSwiftUICore/View/Text/Font/ModifiedFont.swift
@@ -198,6 +198,7 @@ extension Font {
         _openSwiftUIUnimplementedFailure()
     }
 
+    /// Create a version of `self` that uses the specified stylistic set.
     public func _stylisticAlternative(_ alternative: Font._StylisticAlternative) -> Font {
         _openSwiftUIUnimplementedFailure()
     }
@@ -276,6 +277,9 @@ extension Font {
         }
     }
 
+    /// A stylistic alternative to apply to the font
+    /// The mapping of Style to a visual style is specific to the underlying
+    /// font
     public enum _StylisticAlternative: Int, Hashable {
         case one = 1
         case two = 2