From fe205d280c72aac3685cc080fa99caa60fce8564 Mon Sep 17 00:00:00 2001
From: Jacek Czerwonka <9115223+jaccz@users.noreply.github.com>
Date: Thu, 11 Feb 2021 21:14:21 -0800
Subject: [PATCH] Update tools.md

---
 docs/tools.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/tools.md b/docs/tools.md
index 5a7298d..eb731a5 100644
--- a/docs/tools.md
+++ b/docs/tools.md
@@ -2,6 +2,8 @@
 layout: default
 ---
 
+[(back)](./)
+
 # Available Tools
 
 | Tool | Authors | Notes |
@@ -59,3 +61,5 @@ layout: default
 | [Pairwise Pict Online](https://pairwise.yuuniworks.com/) | [Tamura] | PICT on the web | 
 | [CoverTable](https://github.com/walkframe/covertable) | [Yasuyuki] | Python and TypeScript. Open source | 
 
+# Links
+* [Comparison of efficiency](./efficiency.md) 
-- 
GitLab