diff --git a/website/apps/base/libraries-page.scm b/website/apps/base/libraries-page.scm
index c6108f7..688e216 100644
--- a/website/apps/base/libraries-page.scm
+++ b/website/apps/base/libraries-page.scm
@@ -322,6 +322,17 @@ for GNU Guile programs.  It is a wrapper to the underlying
 ;;; Tools implemented with Guile.
 ;;;
 
+(define aatree
+  (package #:name "Guile AA Tree"
+           #:description "Guile AA tree implementation. AA trees are
+self-balancing binary trees, which ensure O(log n) worst case
+performance for core operations. The module provides non-mutating
+insert, delete, and search operations, with support for convenient
+nested tree operations."
+           #:url "http://savannah.nongnu.org/projects/guile-aa-tree"
+           #:tags '("Guile 2.2")
+           #:license "GPL 3 or later"))
+
 (define aiscm
   (package #:name "AIscm"
            #:description "Guile numerical arrays and tensor extension.
@@ -376,7 +387,7 @@ compression. It is written in C and Scheme, with Guile 2.0 bindings."
 (define (%packages-tools)
   "These projects are tools for or implemented with Guile. Mostly, these are
 the types of things that automate documentation or code generation."
-  (list aiscm autogen guix libchop))
+  (list aatree aiscm autogen guix libchop))
 
 
 ;;;