diff --git a/Cargo.lock b/Cargo.lock
index a880080..49e0aad 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -67,6 +67,15 @@ dependencies = [
  "termcolor",
 ]
 
+[[package]]
+name = "clap_complete"
+version = "4.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0012995dc3a54314f4710f5631d74767e73c534b8757221708303e48eef7a19b"
+dependencies = [
+ "clap",
+]
+
 [[package]]
 name = "clap_lex"
 version = "0.3.1"
@@ -212,6 +221,7 @@ dependencies = [
  "alpm",
  "anyhow",
  "clap",
+ "clap_complete",
  "const_format",
  "pacdef_macros",
  "path-absolutize",
diff --git a/_completion.zsh b/_completion.zsh
deleted file mode 100644
index a9beae9..0000000
--- a/_completion.zsh
+++ /dev/null
@@ -1,112 +0,0 @@
-#compdef pacdef
-
-_pacdef() {
-    integer ret=1
-    local line
-
-    if [ -z "${XDG_CONFIG_HOME}" ]; then
-        GROUPDIR="~/.config/pacdef/groups"
-    else
-        GROUPDIR="${XDG_CONFIG_HOME}/pacdef/groups"
-    fi
-
-    function _subcommands {
-        local -a subcommands
-        subcommands=(
-            'group:manage groups (alias: g)'
-            'package:manage packages (alias: p)'
-            'version:show version info (alias: v)'
-        )
-        _describe 'subcommand' subcommands
-    }
-
-    function _group_actions {
-        local -a group_actions
-        group_actions=(
-            'edit:edit an imported group file (alias: e)'
-            'list:show names of imported groups (alias: l)'
-            'import:import a new group file (alias: i)'
-            'new:create a new group file (alias: n)'
-            'remove:remove a group file (alias: r)'
-            'show:show packages under an imported group (alias: s)'
-        )
-        _describe 'group action' group_actions
-    }
-
-
-    function _package_actions {
-        local -a package_actions
-        package_actions=(
-            'clean:uninstall packages not managed by pacdef (alias: c)'
-            'review:review unmanaged packages (alias: r)'
-            'search:show the group containing a package (alias: se)'
-            'sync:install all packages from imported groups (alias: sy)'
-            'unmanaged:show explicitly installed packages not managed by pacdef (alias: u)'
-        )
-        _describe 'package action' package_actions
-    }
-
-    _arguments -C \
-        "1: :_subcommands" \
-        "*::arg:->args" \
-        && ret=0
-
-    case $state in
-        (args)
-            case $line[1] in
-                package)
-                    case $line[2] in
-                        search)
-                            _arguments \
-                                "2:regex:" && ret=0
-                        ;;
-                        (clean|review|sync|unmanaged|help)
-                            _message "no more arguments" && ret=0
-                        ;;
-                        *)
-                            _arguments \
-                                "1: :_package_actions" \
-                                "*::arg:->args" && ret=0
-                        ;;
-                    esac
-                ;;
-                group)
-                    case $line[2] in
-                        list)
-                            _message "no more arguments" && ret=0
-                        ;;
-                        (edit|remove|show)
-                            _arguments "*:group file:_files -W '$GROUPDIR'" && ret=0
-
-                        ;;
-                        import)
-                            _arguments "*:new group file(s):_files" && ret=0
-                        ;;
-                        new)
-                            _arguments \
-                                {-e,--edit}"[edit group file after creating them]" \
-                                "*:new group name(s):" \
-                                && ret=0
-                        ;;
-                        *) _arguments \
-                            "1: :_group_actions" \
-                            "*::arg:->args" && ret=0
-                        ;;
-                    esac
-                ;;
-                version)
-                    _message "no more arguments" && ret=0
-                ;;
-                *)
-                    _message "unknown subcommand" && ret=1
-                ;;
-            esac
-        ;;
-    esac
-
-    return ret
-}
-
-_pacdef
-
-
diff --git a/crates/pacdef_core/Cargo.toml b/crates/pacdef_core/Cargo.toml
index d783ba6..0bef842 100644
--- a/crates/pacdef_core/Cargo.toml
+++ b/crates/pacdef_core/Cargo.toml
@@ -27,3 +27,4 @@ serde_derive = "1.0"
 serde = "1.0"
 
 pacdef_macros = { path = "../pacdef_macros", version = "0.1" }
+clap_complete = "4.1.3"
diff --git a/crates/pacdef_core/src/action.rs b/crates/pacdef_core/src/action.rs
index 31ce1fa..74c1c6b 100644
--- a/crates/pacdef_core/src/action.rs
+++ b/crates/pacdef_core/src/action.rs
@@ -5,6 +5,7 @@ use pacdef_macros::Action;
 #[derive(Debug, Action)]
 pub enum Actions {
     Clean,
+    Completion,
     Edit,
     Import,
     List,
diff --git a/crates/pacdef_core/src/args.rs b/crates/pacdef_core/src/args.rs
index 75a2bc8..40fae52 100644
--- a/crates/pacdef_core/src/args.rs
+++ b/crates/pacdef_core/src/args.rs
@@ -9,17 +9,18 @@ use crate::core::get_version_string;
 
 /// Build the `pacdef` argument parser, with subcommands for `version`,
 /// `group` and `package`.
-fn get_arg_parser() -> Command {
+pub fn build_cli() -> Command {
     let package_cmd = get_package_cmd();
     let group_cmd = get_group_cmd();
     let version_cmd = Command::new(VERSION).about("show version info");
+    let completion_cmd = Command::new(COMPLETION).about("generate shell completion");
 
     Command::new("pacdef")
         .about("declarative package manager for Linux")
         .version(get_version_string())
         .subcommand_required(true)
         .arg_required_else_help(true)
-        .subcommands([package_cmd, group_cmd, version_cmd])
+        .subcommands([package_cmd, group_cmd, version_cmd, completion_cmd])
 }
 
 /// Build the `pacdef group` subcommand.
@@ -67,7 +68,7 @@ fn get_group_cmd() -> Command {
 
     Command::new("group")
         .arg_required_else_help(true)
-        .about("TODO????")
+        .about("manage groups")
         .visible_alias("g")
         .subcommand_required(true)
         .subcommands([edit, import, list, new, remove, show])
@@ -95,7 +96,7 @@ fn get_package_cmd() -> Command {
 
     Command::new("package")
         .arg_required_else_help(true)
-        .about("TODO????")
+        .about("manage packages")
         .visible_alias("p")
         .subcommand_required(true)
         .subcommands([clean, review, unmanaged, search, sync])
@@ -104,7 +105,7 @@ fn get_package_cmd() -> Command {
 /// Get and parse the CLI arguments.
 #[must_use]
 pub fn get() -> clap::ArgMatches {
-    get_arg_parser().get_matches()
+    build_cli().get_matches()
 }
 
 /// For each file argument, return the absolute path to the file.
diff --git a/crates/pacdef_core/src/core.rs b/crates/pacdef_core/src/core.rs
index 8092ca2..d2d1595 100644
--- a/crates/pacdef_core/src/core.rs
+++ b/crates/pacdef_core/src/core.rs
@@ -5,6 +5,7 @@ use std::path::Path;
 
 use anyhow::{anyhow, bail, ensure, Context, Result};
 use clap::ArgMatches;
+use clap_complete::{generate, shells::Zsh};
 use const_format::formatcp;
 
 use crate::action::*;
@@ -84,6 +85,7 @@ impl Pacdef {
             },
 
             Some((VERSION, _)) => Ok(self.show_version()),
+            Some((COMPLETION, _)) => Ok(self.generate_shell_completion()),
 
             Some((_, _)) => panic!("{ACTION_NOT_MATCHED}"),
             None => unreachable!("{UNREACHABLE_ARM}"),
@@ -299,6 +301,16 @@ impl Pacdef {
 
         Ok(())
     }
+
+    #[allow(clippy::unused_self)]
+    fn generate_shell_completion(&self) {
+        generate(
+            Zsh,
+            &mut crate::args::build_cli(),
+            "pacdef",
+            &mut std::io::stdout(),
+        );
+    }
 }
 
 /// For the provided CLI arguments, get the path to each corresponding group file.