fix spelling mistake
diff --git a/src/purelib.py b/src/purelib.py
index 96ddccf..3357de9 100644
--- a/src/purelib.py
+++ b/src/purelib.py
@@ -20,7 +20,7 @@
 
     dot_data_dir = wheel.get_dot_data_directory(extracted_whl_directory)
 
-    # 'Root-Is-Purelib: false' is no gaurante a .date directory exists with
+    # 'Root-Is-Purelib: false' is no guarantee a .date directory exists with
     # package code in it. eg. the 'markupsafe' package.
     if dot_data_dir:
         for child in pathlib.Path(dot_data_dir).iterdir():