diff --git a/README.md b/README.md
index 98d2ef9..04b55c8 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,15 @@ Included since 1.9. Mainly inspired by Meroon.
 
 ### Gauche
 
+### Guile
+
+From [the manual](https://www.gnu.org/software/guile/manual/html_node/GOOPS.html):
+
+> GOOPS is the object oriented extension to Guile. Its implementation
+> is derived from STk-3.99.3 by Erick Gallesio and version 1.3 of
+> Gregor Kiczales’ Tiny-Clos. It is very close in spirit to CLOS, the
+> Common Lisp Object System, but is adapted for the Scheme language.
+
 ### MIT Scheme
 
 ### STk and STklos