diff --git a/phf/Cargo.toml b/phf/Cargo.toml
index f224cafe..23d2b99d 100644
--- a/phf/Cargo.toml
+++ b/phf/Cargo.toml
@@ -8,6 +8,7 @@ repository = "https://github.com/rust-phf/rust-phf"
 edition = "2021"
 readme = "../README.md"
 rust-version = "1.60"
+categories = ["data-structures", "no-std"]
 
 [lib]
 name = "phf"
diff --git a/phf_codegen/Cargo.toml b/phf_codegen/Cargo.toml
index 6c3f1bc5..2f179de4 100644
--- a/phf_codegen/Cargo.toml
+++ b/phf_codegen/Cargo.toml
@@ -8,6 +8,7 @@ repository = "https://github.com/rust-phf/rust-phf"
 edition = "2021"
 readme = "../README.md"
 rust-version = "1.60"
+categories = ["data-structures"]
 
 [dependencies]
 phf_generator = "0.11.0"
diff --git a/phf_generator/Cargo.toml b/phf_generator/Cargo.toml
index 16d6321c..9295aa16 100644
--- a/phf_generator/Cargo.toml
+++ b/phf_generator/Cargo.toml
@@ -7,6 +7,7 @@ description = "PHF generation logic"
 repository = "https://github.com/rust-phf/rust-phf"
 edition = "2021"
 rust-version = "1.60"
+categories = ["data-structures"]
 
 [dependencies]
 rand = { version = "0.8", features = ["small_rng"] }
diff --git a/phf_macros/Cargo.toml b/phf_macros/Cargo.toml
index 42fc2974..dd10d4d2 100644
--- a/phf_macros/Cargo.toml
+++ b/phf_macros/Cargo.toml
@@ -9,6 +9,7 @@ repository = "https://github.com/rust-phf/rust-phf"
 readme = "../README.md"
 include = ["src/lib.rs"]
 rust-version = "1.60"
+categories = ["data-structures"]
 
 [lib]
 proc-macro = true
diff --git a/phf_macros_tests/Cargo.toml b/phf_macros_tests/Cargo.toml
index 9acdf5bc..5c4a748d 100644
--- a/phf_macros_tests/Cargo.toml
+++ b/phf_macros_tests/Cargo.toml
@@ -4,6 +4,8 @@ version = "0.1.0"
 authors = ["Yuki Okushi <jtitor@2k36.org>"]
 edition = "2021"
 rust-version = "1.60"
+repository = "https://github.com/rust-phf/rust-phf"
+categories = ["data-structures"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/phf_shared/Cargo.toml b/phf_shared/Cargo.toml
index 4f7d8aab..7219aac2 100644
--- a/phf_shared/Cargo.toml
+++ b/phf_shared/Cargo.toml
@@ -7,6 +7,7 @@ description = "Support code shared by PHF libraries"
 repository = "https://github.com/rust-phf/rust-phf"
 edition = "2021"
 rust-version = "1.60"
+categories = ["data-structures"]
 
 [lib]
 name = "phf_shared"