diff --git a/src/testdir/shared.vim b/src/testdir/shared.vim
index 3c6fe1c..01d741c 100644
--- a/src/testdir/shared.vim
+++ b/src/testdir/shared.vim
@@ -21,6 +21,8 @@
     let s:python = 'python'
   elseif has('win32')
     " Use Python Launcher for Windows (py.exe) if available.
+    " NOTE: if you get a "Python was not found" error, disable the Python
+    " shortcuts in "Windows menu / Settings / Manage App Execution Aliases".
     if executable('py.exe')
       let s:python = 'py.exe'
     elseif executable('python.exe')