diff --git a/src/lib.rs b/src/lib.rs
index c4f9a8e..ab826ed 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,7 +6,7 @@
 //! This crate only contains integration tests. The other crates
 //! fit into this dependency DAG:
 //! 
-//! ```
+//! ```text
 //! * ptth
 //! |\
 //! | * ptth_server