diff --git a/memory/Cargo.toml b/memory/Cargo.toml
index 7fe7e6b..0958cb7 100644
--- a/memory/Cargo.toml
+++ b/memory/Cargo.toml
@@ -4,6 +4,8 @@ version = "0.3.2"
 edition = "2021"
 description = "Make the handle of sequential codes easier for an input method."
 keywords = ["ime", "memory", "data-structure"]
+category = ["text-processing"]
+
 repository = "https://github.com/pythonbrad/afrim"
 license = "MIT"
 readme = "README.md"