"into helper functions" -> "into a helper function"

Author: insolor

README.md

@@ -7,7 +7,7 @@
 
 Implementation of asynchronous `mainloop` for tkinter, the use of which allows using `async` handler functions.
 It is intended to be as simple to use as possible. No fancy unusual syntax or constructions - just use an alternative
-function instead of `root.mainloop()` and wrap asynchronous handlers into helper functions.
+function instead of `root.mainloop()` and wrap asynchronous handlers into a helper function.
 
 Based on ideas from: