diff --git a/Cargo.toml b/Cargo.toml
index 834f37ec..cee38402 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ include = [
     "/src/**",
     "/tests/**",
 ]
+keywords = ["macros", "syn"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/dtolnay/syn"
diff --git a/json/Cargo.toml b/json/Cargo.toml
index 314dfff0..afa160f5 100644
--- a/json/Cargo.toml
+++ b/json/Cargo.toml
@@ -6,6 +6,7 @@ categories = ["development-tools::procedural-macro-helpers"]
 description = "Syntax tree describing Syn's syntax tree"
 documentation = "https://docs.rs/syn-codegen"
 edition = "2018"
+keywords = ["syn"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dtolnay/syn"