diff --git a/docs/build.md b/docs/build.md
index 474df5a..e2295eb 100644
--- a/docs/build.md
+++ b/docs/build.md
@@ -179,4 +179,4 @@ The Makefile will build the firmware in a docker container and leave the binary
 
 ## APDU Specifications
 
-- [APDU Protocol](docs/APDUSPEC.md)
+- [APDU Protocol](./APDUSPEC.md)