diff --git a/examples/Cargo.toml b/examples/Cargo.toml
index c71a880..9bef1f3 100644
--- a/examples/Cargo.toml
+++ b/examples/Cargo.toml
@@ -4,6 +4,8 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+# Must use local verion here, otherwise there will be multiple versions of `libcsp-sys`, and
+# cargo can not deal with this due to the link section.
 libcsp = { version = "0.1", path = ".." }
 
 [build-dependencies]