diff --git a/docs/typed-libraries.md b/docs/typed-libraries.md
index 600bdce66..5c25afc90 100644
--- a/docs/typed-libraries.md
+++ b/docs/typed-libraries.md
@@ -40,11 +40,11 @@ Each module exposes a set of symbols. Some of these symbols are considered “pr
 
 The following idioms are supported for defining the values contained within `__all__`. These restrictions allow type checkers to statically determine the value of `__all__`.
 
-* `__all__ = ('a', b')`
-* `__all__ = ['a', b']`
-* `__all__ += ['a', b']`
+* `__all__ = ('a', 'b')`
+* `__all__ = ['a', 'b']`
+* `__all__ += ['a', 'b']`
 * `__all__ += submodule.__all__`
-* `__all__.extend(['a', b'])`
+* `__all__.extend(['a', 'b'])`
 * `__all__.extend(submodule.__all__)`
 * `__all__.append('a')`
 * `__all__.remove('a')`