diff --git a/src/double_priority_queue/mod.rs b/src/double_priority_queue/mod.rs
index 0e139fb..c9ff33d 100644
--- a/src/double_priority_queue/mod.rs
+++ b/src/double_priority_queue/mod.rs
@@ -999,7 +999,7 @@ fn better_to_rebuild(len1: usize, len2: usize) -> bool {
 }
 
 #[cfg(feature = "serde")]
-#![cfg_attr(docsrs, doc(cfg(feature = "serde")))]
+#[cfg_attr(docsrs, doc(cfg(feature = "serde")))]
 mod serde {
     use std::cmp::{Eq, Ord};
     use std::hash::{BuildHasher, Hash};
diff --git a/src/lib.rs b/src/lib.rs
index 401cfff..6b2af2f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -87,6 +87,7 @@
 //! ```
 
 #![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 
 #[cfg(not(feature = "std"))]
 extern crate alloc;
diff --git a/src/priority_queue/mod.rs b/src/priority_queue/mod.rs
index fc2f2ae..99bdef2 100644
--- a/src/priority_queue/mod.rs
+++ b/src/priority_queue/mod.rs
@@ -791,7 +791,7 @@ fn better_to_rebuild(len1: usize, len2: usize) -> bool {
 }
 
 #[cfg(feature = "serde")]
-#![cfg_attr(docsrs, doc(cfg(feature = "serde")))]
+#[cfg_attr(docsrs, doc(cfg(feature = "serde")))]
 mod serde {
     use std::cmp::{Eq, Ord};
     use std::hash::{BuildHasher, Hash};