diff --git a/Sources/Extensions.swift b/Sources/Extensions.swift
index d31812b..f7c1df0 100644
--- a/Sources/Extensions.swift
+++ b/Sources/Extensions.swift
@@ -1,26 +1,31 @@
 import Foundation
 
 public extension Bundle {
+    /// Returns the path for requested resource in this bundle.
     func path(forResource: String, ofType: String?) -> Path? {
         let f: (String?, String?) -> String? = path(forResource:ofType:)
         let str = f(forResource, ofType)
         return str.flatMap(Path.init)
     }
 
+    /// Returns the path for the shared-frameworks directory in this bundle.
     public var sharedFrameworks: Path? {
         return sharedFrameworksPath.flatMap(Path.init)
     }
 
+    /// Returns the path for the resources directory in this bundle.
     public var resources: Path? {
         return resourcePath.flatMap(Path.init)
     }
 
+    /// Returns the path for this bundle.
     public var path: Path {
         return Path(string: bundlePath)
     }
 }
 
 public extension String {
+    /// Initializes this `String` with the contents of the provided path.
     @inlinable
     init(contentsOf path: Path) throws {
         try self.init(contentsOfFile: path.string)
@@ -36,6 +41,7 @@ public extension String {
 }
 
 public extension Data {
+    /// Initializes this `Data` with the contents of the provided path.
     @inlinable
     init(contentsOf path: Path) throws {
         try self.init(contentsOf: path.url)
diff --git a/Sources/Path+Attributes.swift b/Sources/Path+Attributes.swift
index 7baee84..613c473 100644
--- a/Sources/Path+Attributes.swift
+++ b/Sources/Path+Attributes.swift
@@ -43,14 +43,18 @@ public extension Path {
         return self
     }
 
-    /// - Returns: modification-time or creation-time if none
+    /**
+     Returns the modification-time.
+     - Note: Returns the creation time if there is no modification time.
+     - Note: Returns UNIX-time-zero if neither are available, though this *should* be impossible.
+     */
     public var mtime: Date {
         do {
             let attrs = try FileManager.default.attributesOfItem(atPath: string)
             return attrs[.modificationDate] as? Date ?? attrs[.creationDate] as? Date ?? Date()
         } catch {
-            //TODO print(error)
-            return Date()
+            //TODO log error
+            return Date(timeIntervalSince1970: 0)
         }
     }
 }
diff --git a/Sources/Path+Codable.swift b/Sources/Path+Codable.swift
index c57bf5c..b87d424 100644
--- a/Sources/Path+Codable.swift
+++ b/Sources/Path+Codable.swift
@@ -1,6 +1,7 @@
 import Foundation
 
 public extension CodingUserInfoKey {
+    /// If set paths are encoded as relative to this path.
     static let relativePath = CodingUserInfoKey(rawValue: "dev.mxcl.Path.relative")!
 }
 
diff --git a/Sources/Path+FileManager.swift b/Sources/Path+FileManager.swift
index 84d7fa9..b1d3927 100644
--- a/Sources/Path+FileManager.swift
+++ b/Sources/Path+FileManager.swift
@@ -41,6 +41,14 @@ public extension Path {
         return rv
     }
 
+    /**
+     Moves a file.
+     - Note: `throws` if `to` is a directory.
+     - Parameter to: Destination filename.
+     - Parameter overwrite: If true overwrites any file that already exists at `to`.
+     - Returns: `to` to allow chaining
+     - SeeAlso: move(into:overwrite:)
+     */
     @discardableResult
     public func move(to: Path, overwrite: Bool = false) throws -> Path {
         if overwrite, to.exists {
@@ -50,6 +58,17 @@ public extension Path {
         return to
     }
 
+    /**
+     Moves a file into a directory
+
+     If the destination does not exist, this function creates the directory first.
+
+     - Note: `throws` if `into` is a file.
+     - Parameter into: Destination directory
+     - Parameter overwrite: If true overwrites any file that already exists at `into`.
+     - Returns: The `Path` of destination filename.
+     - SeeAlso: move(into:overwrite:)
+     */
     @discardableResult
     public func move(into: Path) throws -> Path {
         if !into.exists {
@@ -62,17 +81,23 @@ public extension Path {
         return rv
     }
 
+    /// Deletes the path, recursively if a directory.
     @inlinable
     public func delete() throws {
         try FileManager.default.removeItem(at: url)
     }
 
+    /**
+     Creates an empty file at this path.
+     - Returns: `self` to allow chaining.
+     */
     @inlinable
     @discardableResult
     func touch() throws -> Path {
         return try "".write(to: self)
     }
 
+    /// Helper due to Linux Swift being incomplete.
     private func _foo(go: () throws -> Void) throws {
     #if !os(Linux)
         do {
@@ -92,6 +117,11 @@ public extension Path {
     #endif
     }
 
+    /**
+     Creates the directory at this path.
+     - Note: Does not create any intermediary directories.
+     - Returns: `self` to allow chaining.
+     */
     @discardableResult
     public func mkdir() throws -> Path {
         try _foo {
@@ -100,6 +130,11 @@ public extension Path {
         return self
     }
 
+    /**
+     Creates the directory at this path.
+     - Note: Creates any intermediary directories, if required.
+     - Returns: `self` to allow chaining.
+     */
     @discardableResult
     public func mkpath() throws -> Path {
         try _foo {
@@ -108,8 +143,15 @@ public extension Path {
         return self
     }
 
-    /// - Note: If file doesn’t exist, creates file
-    /// - Note: If file is not writable, makes writable first, resetting permissions after the write
+    /**
+     Replaces the contents of the file at this path with the provided string.
+     - Note: If file doesn’t exist, creates file
+     - Note: If file is not writable, makes writable first, resetting permissions after the write
+     - Parameter contents: The string that will become the contents of this file.
+     - Parameter atomically: If `true` the operation will be performed atomically.
+     - Parameter encoding: The string encoding to use.
+     - Returns: `self` to allow chaining.
+     */
     @discardableResult
     public func replaceContents(with contents: String, atomically: Bool = false, encoding: String.Encoding = .utf8) throws -> Path {
         let resetPerms: Int?
diff --git a/Sources/Path+StringConvertibles.swift b/Sources/Path+StringConvertibles.swift
index b907691..e197016 100644
--- a/Sources/Path+StringConvertibles.swift
+++ b/Sources/Path+StringConvertibles.swift
@@ -9,12 +9,14 @@ extension Path: LosslessStringConvertible {
 }
 
 extension Path: CustomStringConvertible {
+    /// Returns `Path.string`
     public var description: String {
         return string
     }
 }
 
 extension Path: CustomDebugStringConvertible {
+    /// Returns eg. `Path(string: "/foo")`
     public var debugDescription: String {
         return "Path(string: \(string))"
     }
diff --git a/Sources/Path+ls.swift b/Sources/Path+ls.swift
index c0d81c3..1dfe475 100644
--- a/Sources/Path+ls.swift
+++ b/Sources/Path+ls.swift
@@ -13,12 +13,14 @@ public extension Path {
 }
 
 public extension Array where Element == Path.Entry {
+    /// Filters the list of entries to be a list of Paths that are directories.
     var directories: [Path] {
         return compactMap {
             $0.kind == .directory ? $0.path : nil
         }
     }
 
+    /// Filters the list of entries to be a list of Paths that are files with the specified extension
     func files(withExtension ext: String) -> [Path] {
         return compactMap {
             $0.kind == .file && $0.path.extension == ext ? $0.path : nil
diff --git a/Sources/Path->Bool.swift b/Sources/Path->Bool.swift
index ad1f885..874cf21 100644
--- a/Sources/Path->Bool.swift
+++ b/Sources/Path->Bool.swift
@@ -1,24 +1,29 @@
 import Foundation
 
 public extension Path {
+    /// Returns true if the path represents an actual file that is also writable by the current user.
     var isWritable: Bool {
         return FileManager.default.isWritableFile(atPath: string)
     }
 
+    /// Returns true if the path represents an actual directory.
     var isDirectory: Bool {
         var isDir: ObjCBool = false
         return FileManager.default.fileExists(atPath: string, isDirectory: &isDir) && isDir.boolValue
     }
 
+    /// Returns true if the path represents an actual filesystem entry that is *not* a directory.
     var isFile: Bool {
         var isDir: ObjCBool = true
         return FileManager.default.fileExists(atPath: string, isDirectory: &isDir) && !isDir.boolValue
     }
 
+    /// Returns true if the path represents an actual file that is also executable by the current user.
     var isExecutable: Bool {
         return FileManager.default.isExecutableFile(atPath: string)
     }
 
+    /// Returns true if the path represents an actual filesystem entry.
     var exists: Bool {
         return FileManager.default.fileExists(atPath: string)
     }
diff --git a/Sources/Path.swift b/Sources/Path.swift
index 858e3c0..145f7a5 100644
--- a/Sources/Path.swift
+++ b/Sources/Path.swift
@@ -1,16 +1,32 @@
 import Foundation
 
+/**
+ Represents a platform filesystem absolute path.
+
+ The recommended conversions from string are:
+
+     let p1 = Path.root/pathString
+     let p2 = Path.root/url.path
+     let p3 = Path.cwd/relativePathString
+     let p4 = Path(userInput) ?? Path.cwd/userInput
+
+ - Note: There may not be an actual filename at the path.
+ */
 public struct Path: Equatable, Hashable, Comparable {
+    /// The underlying filesystem path
     public let string: String
 
+    /// Returns a `Path` containing ``FileManager.default.currentDirectoryPath`.
     public static var cwd: Path {
         return Path(string: FileManager.default.currentDirectoryPath)
     }
 
+    /// Returns a `Path` representing the root path.
     public static var root: Path {
         return Path(string: "/")
     }
 
+    /// Returns a `Path` representing the user’s home directory
     public static var home: Path {
         let string: String
       #if os(macOS)
@@ -25,21 +41,42 @@ public struct Path: Equatable, Hashable, Comparable {
         return Path(string: string)
     }
 
+    /**
+     Returns the filename extension of this path.
+     - Remark: Implemented via `NSString.pathExtension`.
+     */
     @inlinable
     public var `extension`: String {
         return (string as NSString).pathExtension
     }
 
-    /// - Note: always returns a valid path, `Path.root.parent` *is* `Path.root`
+    /**
+     Returns the parent directory for this path.
+
+     Path is not aware of the nature of the underlying file, but this is
+     irrlevant since the operation is the same irrespective of this fact.
+
+     - Note: always returns a valid path, `Path.root.parent` *is* `Path.root`.
+     */
     public var parent: Path {
         return Path(string: (string as NSString).deletingLastPathComponent)
     }
 
+    /// Returns a `URL` representing this file path.
     @inlinable
     public var url: URL {
         return URL(fileURLWithPath: string)
     }
 
+    /**
+     The basename for the provided file, optionally dropping the file extension.
+
+         Path.root.join("foo.swift").basename()  // => "foo.swift"
+         Path.root.join("foo.swift").basename(dropExtension: true)  // => "foo"
+
+     - Returns: A string that is the filename’s basename.
+     - Parameter dropExtension: If `true` returns the basename without its file extension.
+     */
     public func basename(dropExtension: Bool = false) -> String {
         let str = string as NSString
         if !dropExtension {
@@ -54,7 +91,13 @@ public struct Path: Equatable, Hashable, Comparable {
         }
     }
 
-    //TODO another variant that returns `nil` if result would start with `..`
+    /**
+     Returns a string representing the relative path to `base`.
+
+     - Note: If `base` is not a logical prefix for `self` your result will be prefixed some number of `../` components.
+     - Parameter base: The base to which we calculate the relative path.
+     - ToDo: Another variant that returns `nil` if result would start with `..`
+     */
     public func relative(to base: Path) -> String {
         // Split the two paths into their components.
         // FIXME: The is needs to be optimized to avoid unncessary copying.
@@ -85,27 +128,59 @@ public struct Path: Equatable, Hashable, Comparable {
         }
     }
 
-    public func join<S>(_ part: S) -> Path where S: StringProtocol {
+    /**
+     Joins a path and a string to produce a new path.
+
+         Path.root.join("a")             // => /a
+         Path.root.join("a/b")           // => /a/b
+         Path.root.join("a").join("b")   // => /a/b
+         Path.root.join("a").join("/b")  // => /a/b
+
+     - Parameter pathComponent: The string to join with this path.
+     - Returns: A new joined path.
+     - SeeAlso: /(:Path,:String)
+     */
+    public func join<S>(_ pathComponent: S) -> Path where S: StringProtocol {
         //TODO standardizingPath does more than we want really (eg tilde expansion)
-        let str = (string as NSString).appendingPathComponent(String(part))
+        let str = (string as NSString).appendingPathComponent(String(pathComponent))
         return Path(string: (str as NSString).standardizingPath)
     }
 
+    /// Returns the locale-aware sort order for the two paths.
     @inlinable
     public static func <(lhs: Path, rhs: Path) -> Bool {
         return lhs.string.compare(rhs.string, locale: .current) == .orderedAscending
     }
 
+    /// A file entry from a directory listing.
     public struct Entry {
+        /// The kind of this directory entry.
         public enum Kind {
+            /// The path is a file.
             case file
+            /// The path is a directory.
             case directory
         }
+        /// The kind of this entry.
         public let kind: Kind
+        /// The path of this entry.
         public let path: Path
     }
 }
 
+/**
+ Joins a path and a string to produce a new path.
+
+     Path.root/"a"       // => /a
+     Path.root/"a/b"     // => /a/b
+     Path.root/"a"/"b"   // => /a/b
+     Path.root/"a"/"/b"  // => /a/b
+
+ - Parameter lhs: The base path to join with `rhs`.
+ - Parameter rhs: The string to join with this `lhs`.
+ - Returns: A new joined path.
+ - SeeAlso: Path.join(_:)
+ */
 @inlinable
 public func /<S>(lhs: Path, rhs: S) -> Path where S: StringProtocol {
     return lhs.join(rhs)