diff --git a/_license-tool b/_license-tool
new file mode 100644
index 0000000..bb2f396
--- /dev/null
+++ b/_license-tool
@@ -0,0 +1,24 @@
+#compdef license-tool
+
+_license-tool_files() {
+    # system dir
+    local system_dir="/usr/share/license-tool/"
+    for file in "${system_dir}"**(N); do
+        compadd -X "[system]" "${file#"${system_dir}"}"
+    done
+
+    # user dir
+    if [[ -v XDG_CONFIG_HOME ]]; then
+        local user_dir="${XDG_CONFIG_HOME}/license-tool/"
+    else
+        local user_dir="${HOME}/.config/license-tool/"
+    fi
+    for file in "${user_dir}"**(N); do
+        compadd -X "[user]" "${file#"${user_dir}"}"
+    done
+}
+
+_arguments \
+    '-h[print help]' \
+    '-o[output file]:output:_files' \
+    '*:license:_license-tool_files'
diff --git a/install.sh b/install.sh
index db95e4f..97686d0 100755
--- a/install.sh
+++ b/install.sh
@@ -12,6 +12,7 @@ cargo build --release
 
 sudo sh << EOF
 cp target/release/license-tool "$PREFIX/bin/license-tool"
+cp _license-tool "$PREFIX/share/zsh/site-functions/_license-tool"
 printf "Installing licenses to '%s'\n" "$GLOBAL_DATA_PATH"
 rm -rf "$GLOBAL_DATA_PATH"
 cp -R licenses "$GLOBAL_DATA_PATH"