diff --git a/README.md b/README.md
index e58e828921..52f7c57491 100644
--- a/README.md
+++ b/README.md
@@ -771,7 +771,7 @@ make
 
 The Objective C implementation of mal has been built and tested on
 Linux using clang/LLVM 3.6. It has also been built and tested on OS
-X using XCode 7.
+X using Xcode 7.
 
 ```
 cd impls/objc
@@ -1111,7 +1111,7 @@ make sml_MODE=mosml
 
 ### Swift
 
-The Swift implementation of mal requires the Swift 2.0 compiler (XCode
+The Swift implementation of mal requires the Swift 2.0 compiler (Xcode
 7.0) to build. Older versions will not work due to changes in the
 language and standard library.
 
diff --git a/impls/tests/docker/Dockerfile b/impls/tests/docker/Dockerfile
index 71b7ed0a3e..62f2ce09ba 100644
--- a/impls/tests/docker/Dockerfile
+++ b/impls/tests/docker/Dockerfile
@@ -169,7 +169,7 @@ RUN cd /usr/lib/x86_64-linux-gnu/ \
     && rm factor-linux-x86-64-0.97.tar.gz
 
 # MATLAB is proprietary/licensed. Maybe someday with Octave.
-# Swift is XCode/OS X only
+# Swift is Xcode/macOS only
 ENV SKIP_IMPLS matlab swift
 
 ENV DEBIAN_FRONTEND newt