diff --git a/utils/build_swift/README.md b/utils/build_swift/README.md
index a07ea4789f158..42b890e223e08 100644
--- a/utils/build_swift/README.md
+++ b/utils/build_swift/README.md
@@ -8,5 +8,5 @@ the Swift build-script.
 You may run the unit test suite using the command:
 
 ```sh
-$ python utils/build_swift/run_tests.py
+$ python3 utils/build_swift/run_tests.py
 ```
diff --git a/utils/pygments/README.txt b/utils/pygments/README.txt
index c4995a6f8d3cf..702d691f08117 100644
--- a/utils/pygments/README.txt
+++ b/utils/pygments/README.txt
@@ -30,7 +30,7 @@ Copy the `swift.py` file to this directory.
 
 Execute the Pygments config script:
 
-    $ python _mapping.py
+    $ python3 _mapping.py
 
 Usage
 =====
diff --git a/utils/swift_build_support/README.md b/utils/swift_build_support/README.md
index 4efae0cddb4d9..53b025d0fb58c 100644
--- a/utils/swift_build_support/README.md
+++ b/utils/swift_build_support/README.md
@@ -6,5 +6,5 @@ structures used by the Swift build script.
 You may run unit tests for `swift_build_support` from the command line:
 
 ```sh
-$ python utils/swift_build_support/run_tests.py
+$ python3 utils/swift_build_support/run_tests.py
 ```