diff --git a/Sources/SwiftShell/Context.swift b/Sources/SwiftShell/Context.swift
index c16b09b..57773e6 100755
--- a/Sources/SwiftShell/Context.swift
+++ b/Sources/SwiftShell/Context.swift
@@ -12,8 +12,8 @@ public protocol ShellContextType: CustomDebugStringConvertible {
 	var env: [String: String] {get set}
 
 	var stdin: ReadableStream {get set}
-	var stdout: WriteableStream {get set}
-	var stderror: WriteableStream {get set}
+	var stdout: WritableStream {get set}
+	var stderror: WritableStream {get set}
 
 	/**
 	The current working directory.
@@ -39,8 +39,8 @@ public struct ShellContext: ShellContextType {
 	public var env: [String: String]
 
 	public var stdin: ReadableStream
-	public var stdout: WriteableStream
-	public var stderror: WriteableStream
+	public var stdout: WritableStream
+	public var stderror: WritableStream
 
 	/**
 	The current working directory.
@@ -112,8 +112,8 @@ public final class MainShellContext: ShellContextType {
 	public lazy var env = ProcessInfo.processInfo.environment as [String: String]
 
 	public lazy var stdin: ReadableStream = { FileHandleStream(FileHandle.standardInput, encoding: self.encoding) }()
-	public lazy var stdout: WriteableStream = { StdoutStream.default }()
-	public lazy var stderror: WriteableStream = { FileHandleStream(FileHandle.standardError, encoding: self.encoding) }()
+	public lazy var stdout: WritableStream = { StdoutStream.default }()
+	public lazy var stderror: WritableStream = { FileHandleStream(FileHandle.standardError, encoding: self.encoding) }()
 
 	/**
 	The current working directory.
diff --git a/Sources/SwiftShell/Files.swift b/Sources/SwiftShell/Files.swift
index 18133b0..0c0e21f 100755
--- a/Sources/SwiftShell/Files.swift
+++ b/Sources/SwiftShell/Files.swift
@@ -60,7 +60,7 @@ If the file already exists and overwrite=false, the writing will begin at the en
 
 - parameter overwrite: If true, replace the file if it exists.
 */
-public func open (forWriting path: URL, overwrite: Bool = false, encoding: String.Encoding = main.encoding) throws -> WriteableStream {
+public func open (forWriting path: URL, overwrite: Bool = false, encoding: String.Encoding = main.encoding) throws -> WritableStream {
 
 	if overwrite || !Files.fileExists(atPath: path.path) {
 		_ = Files.createFile(atPath: path.path, contents: nil, attributes: nil)
@@ -82,7 +82,7 @@ If the file already exists and overwrite=false, the writing will begin at the en
 
 - parameter overwrite: If true, replace the file if it exists.
 */
-public func open (forWriting path: String, overwrite: Bool = false, encoding: String.Encoding = main.encoding) throws -> WriteableStream {
+public func open (forWriting path: String, overwrite: Bool = false, encoding: String.Encoding = main.encoding) throws -> WritableStream {
 	let fixedpath = path.hasPrefix("~") ? NSString(string: path).expandingTildeInPath : path
 	return try open(forWriting: URL(fileURLWithPath: fixedpath, isDirectory: false), overwrite: overwrite, encoding:  encoding)
 }
diff --git a/Sources/SwiftShell/Stream.swift b/Sources/SwiftShell/Stream.swift
index aa7f706..40b71e3 100755
--- a/Sources/SwiftShell/Stream.swift
+++ b/Sources/SwiftShell/Stream.swift
@@ -114,7 +114,7 @@ extension ReadableStream {
 
 
 /** An output stream, like standard output or a writeable file. */
-public protocol WriteableStream : class, TextOutputStream {
+public protocol WritableStream : class, TextOutputStream {
 
 	var filehandle: FileHandle { get }
 	var encoding: String.Encoding {get set}
@@ -126,7 +126,7 @@ public protocol WriteableStream : class, TextOutputStream {
 	func close ()
 }
 
-extension WriteableStream {
+extension WritableStream {
 
 	/**
 	Writes the textual representations of the given items into the stream.
@@ -143,7 +143,7 @@ extension WriteableStream {
 	}
 }
 
-extension FileHandleStream: WriteableStream {
+extension FileHandleStream: WritableStream {
 
 	public func write <T> (_ x: T) {
 		if filehandle.fileDescriptor == STDOUT_FILENO {
@@ -158,8 +158,8 @@ extension FileHandleStream: WriteableStream {
 	}
 }
 
-/** Singleton WriteableStream used only for `print`ing to stdout with the default main.stdout. */
-internal class StdoutStream: WriteableStream {
+/** Singleton WritableStream used only for `print`ing to stdout with the default main.stdout. */
+internal class StdoutStream: WritableStream {
 	public var filehandle: FileHandle {
 		return FileHandle.standardOutput
 	}
@@ -178,7 +178,7 @@ internal class StdoutStream: WriteableStream {
 }
 
 /** Create a pair of streams. What is written to the 1st one can be read from the 2nd one. */
-public func streams () -> (WriteableStream, ReadableStream) {
+public func streams () -> (WritableStream, ReadableStream) {
 	let pipe = Pipe()
 	return (FileHandleStream(pipe.fileHandleForWriting), FileHandleStream(pipe.fileHandleForReading))
 }