diff --git a/src/lib.rs b/src/lib.rs
index 7bf02f1d80..1fd8b0aad0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -38,7 +38,7 @@
 //!
 //! - `cortex-m-7`. This opt-in feature changes the `cortex-m` version from the default 0.6 to the newer 0.7. 
 //! This is to use the `InterruptNumber` trait instead of the `Nr` trait for interrupt numbers. 
-//! Enabling this feature **requires disabling the default features** (see PR #509).
+//! Enabling this feature **requires disabling the default features**.
 
 #![deny(missing_docs)]
 #![deny(rust_2018_compatibility)]