diff --git a/README.md b/README.md
index c10825bf231579b1f29b548d81975f4ce54bb9f1..468885b2dfd0baa8071b66855c9cd24dc7c9dc55 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@
     - PPE
         - shields
             - https://gitlab.cba.mit.edu/alfonso/covid19-fast-kirishield
+        - masks
+            - https://gitlab.cba.mit.edu/pub/coronavirus/the-maski/-/blob/master/README.md
         - testing
             - https://gitlab.cba.mit.edu/pub/coronavirus/tracking/-/blob/master/README.md
         - filter media