diff --git a/Cargo.toml b/Cargo.toml
index aa51dc3..4b4adb4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,7 @@ version = "0.5.2"
 authors = ["Philipp Oppermann <dev@phil-opp.com>"]
 license = "MIT OR Apache-2.0"
 keywords = ["volatile"]
+categories = ["no-std", "no-std::no-alloc"]
 description = "Volatile wrapper types for raw pointers"
 documentation = "https://docs.rs/volatile"
 repository = "https://github.com/rust-osdev/volatile"