diff --git a/README.md b/README.md
index c2a4f83..cbe6105 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,4 @@
 
 Research into births and population trends for people with Down syndrome.
 
-- [US Birth Certificates](./projects/us-birth-certificates/)
+- [US Birth Certificates](./projects/us_birth_-_certificates/)