From 0abd5bd3c0e38e352e9ba38268e04e1c858ab01e Mon Sep 17 00:00:00 2001
From: Eduardo Julian
Date: Thu, 15 Jul 2021 00:45:15 -0400
Subject: Re-named "spec" hierarchy to "specification".

---
 documentation/bookmark/time.md | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'documentation/bookmark/time.md')

diff --git a/documentation/bookmark/time.md b/documentation/bookmark/time.md
index caa6f16a6..6053c5d87 100644
--- a/documentation/bookmark/time.md
+++ b/documentation/bookmark/time.md
@@ -1,4 +1,7 @@
 # Reference
 
+1. [Calendarific: Worldwide Holidays and Observances RESTful API](https://calendarific.com/)
+1. [UTC with Smoothed Leap Seconds (UTC-SLS)](https://www.cl.cam.ac.uk/~mgk25/time/utc-sls/)
+1. [Hashed and Hierarchical Timing Wheels](https://paulcavallaro.com/blog/hashed-and-hierarchical-timing-wheels/)
 1. [Storing UTC is not a silver bullet](https://codeblog.jonskeet.uk/2019/03/27/storing-utc-is-not-a-silver-bullet/)
 
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