diff --git a/README.md b/README.md
index 68da0406e9e7c0244e7ca75c2af5d9ac68068085..0cd716edc78a8ce2b30e62894a6e2b51d3c0cbf8 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,10 @@ under the [Center for Scientific Collaboration and Community Engagement's][cscce
 concept of a *Community Playbook*, as part of the
 [CSCCE Community Engagement Fellows Program][cefp-homepage] 2019 (CEFP2019).
 
+We use `toc.html` taken from
+[this amazing repo from GitHub user _allejo_](https://github.com/allejo/jekyll-toc)
+under an MIT license to generate in-page table of contents.
+
 ## Build info
 
 The [site][docs] is built with [Jekyll][jekyll]