--- a/handouts/pep-ho.tex	Thu Jan 17 00:53:24 2019 +0000
+++ b/handouts/pep-ho.tex	Mon Jan 21 16:04:30 2019 +0000
@@ -27,6 +27,11 @@
 % http://courses.cms.caltech.edu/cs134/cs134b/book.pdf
 % http://alexott.net/en/fp/books/
 
+%John Hughes’ simple words:
+%A combinator is a function which builds program fragments
+%from program fragments.
+
+
 \begin{document}
 \fnote{\copyright{} Christian Urban, King's College London, 2017, 2018}