diff --git a/Cargo.toml b/Cargo.toml
index 1ee4537..83cf130 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "autocfg"
-version = "1.3.0"
+version = "1.4.0"
 authors = ["Josh Stone <cuviper@gmail.com>"]
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/cuviper/autocfg"
diff --git a/README.md b/README.md
index 4265d86..d8985b2 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,13 @@ should only be used when the compiler supports it.
 
 ## Release Notes
 
+- 1.4.0 (2024-09-26)
+
+  - Add `emit_possibility` for Rust 1.80's [checked cfgs], and call that
+    automatically for methods that conditionally `emit`, by @Techcable.
+
+[checked cfgs]: https://blog.rust-lang.org/2024/05/06/check-cfg.html
+
 - 1.3.0 (2024-05-03)
 
   - Add `probe_raw` for direct control of the code that will be test-compiled.