diff --git a/README.md b/README.md
index d40a2493ae24dc848c551560702e0213ca278a91..482ee6d160cd791b00057b5d1776546c6551ecc0 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,7 @@ Institutional Interventions
 - Fab Labs help with recycling PPE that has been stored for an adequate time period
 - Evaluation of resuse/recycle approach vs business as usual
 
-
+[WHO guidance on extending use and reprocessing PPE](https://apps.who.int/iris/bitstream/handle/10665/331695/WHO-2019-nCov-IPC_PPE_use-2020.3-eng.pdf)
 
 
 General approaches