diff --git a/README.md b/README.md
index d0d93d5..ecb4861 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ A few other SRE books/reports are available as directly from Google or publisher
 - [Creating a Production Launch Plan](https://sre.google/resources/practices-and-processes/production-launch-planning/) - [[PDF](https://googlesre.page.link/plpgh)]  [[EPUB](https://web.archive.org/web/20210702003102/https://sre.google/static/pdf/cplp-epub.zip)]  [[MOBI](https://web.archive.org/web/20210102115046/https://sre.google/static/pdf/cplp-mobi.zip)]
 - [Case Studies in Infrastructure Change Management](https://get.oreilly.com/ind_case-studies-in-infrastructure-change-management.html) - [[PDF](https://web.archive.org/web/20210702035412/https://static.googleusercontent.com/media/sre.google/en//static/pdf/case-studies-infrastructure-change-management.pdf)]
 - [A Case Study in Community-Driven Software Adoption](https://www.oreilly.com/library/view/a-case-study/9781098114596/) - [[PDF](https://web.archive.org/web/20210702035416/https://static.googleusercontent.com/media/sre.google/en//static/pdf/community-driven-software-adoption.pdf)]  [[EPUB](https://web.archive.org/web/20210702003151/https://sre.google/static/pdf/community-driven-software-adoption-epub.zip)]  [[MOBI](https://web.archive.org/web/20210702003132/https://sre.google/static/pdf/community-driven-software-adoption-mobi.zip)]
-- [Incident Metrics in SRE](https://sre.google/resources/practices-and-processes/incident-metrics-in-sre/) - [[PDF](https://sre.google/static/pdf/incident_metrics_in_sre.pdf)]  [[EPUB](https://sre.google/static/pdf/incident_metrics_in_sre.epub)]
+- [Incident Metrics in SRE](https://sre.google/resources/practices-and-processes/incident-metrics-in-sre/) - [[PDF🔻](https://sre.google/static/pdf/incident_metrics_in_sre.pdf)]  [[EPUB🔻](https://sre.google/static/pdf/incident_metrics_in_sre.epub)]
 - [Engineering Reliable Mobile Applications](https://www.oreilly.com/library/view/engineering-reliable-mobile/9781492057444/) - [[PDF](https://web.archive.org/web/20211011151056/https://static.googleusercontent.com/media/sre.google/en//static/pdf/engineering-reliable-mobile-applications.pdf)]  [[EPUB](https://web.archive.org/web/20210702082730if_/https://sre.google/static/pdf/engineering-reliable-mobile-applications-epub.zip)]  [[MOBI 🔻](https://sre.google/static/pdf/engineering-reliable-mobile-applications-mobi.zip)]
 
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