diff --git a/Cargo.toml b/Cargo.toml
index bf46071..38e0b9d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,4 @@ license = "MIT/Apache-2.0"
 description = "Fast functions for printing integer primitives to an io::Write"
 repository = "https://github.com/dtolnay/itoa"
 documentation = "https://github.com/dtolnay/itoa"
+categories = ["value-formatting"]