diff --git a/client/client.go b/client/client.go
index 27c9078..f561338 100644
--- a/client/client.go
+++ b/client/client.go
@@ -1,3 +1,4 @@
+// Package client wires together the repos and remotes layers and exposes a unified Client.
 package client
 
 import (
@@ -23,6 +24,7 @@ import (
 	"golang.org/x/time/rate"
 )
 
+// Client provides the full set of cross-repo git operations backed by the GitHub API.
 type Client struct {
 	*repos.Repos
 	remoteMgr   *remotes.Remotes
@@ -32,6 +34,7 @@ type Client struct {
 	ghHTTPSAuth *sshgit.Password
 }
 
+// New constructs a Client from cfg, initialising SSH auth, HTTPS auth, the GitHub API client, and rate limiter.
 func New(cfg *config.Config) (*Client, error) {
 	pool := trust.New()
 
@@ -145,6 +148,7 @@ func knownHostsCallback() (ssh.HostKeyCallback, error) {
 	return cb, nil
 }
 
+// GetLogins returns the authenticated user's login and all org logins, lowercased.
 func (c *Client) GetLogins(ctx context.Context) ([]string, error) {
 	logins := []string{}
 
@@ -181,22 +185,27 @@ func (c *Client) GetLogins(ctx context.Context) ([]string, error) {
 	return logins, nil
 }
 
+// Remotes runs git remote across all dirs.
 func (c *Client) Remotes(ctx context.Context, dirs []string, args ...string) error {
 	return c.remoteMgr.Remotes(ctx, dirs, args...)
 }
 
+// Add runs git remote add across all dirs, building the remote URL from baseURL and each dir basename.
 func (c *Client) Add(ctx context.Context, dirs []string, name, baseURL string) error {
 	return c.remoteMgr.Add(ctx, dirs, name, baseURL)
 }
 
+// Remove runs git remote remove across all dirs.
 func (c *Client) Remove(ctx context.Context, dirs []string, name string) error {
 	return c.remoteMgr.Remove(ctx, dirs, name)
 }
 
+// Rename runs git remote rename across all dirs.
 func (c *Client) Rename(ctx context.Context, dirs []string, oldName, newName string) error {
 	return c.remoteMgr.Rename(ctx, dirs, oldName, newName)
 }
 
+// SetURLs runs git remote set-url across all dirs, building the URL from baseURL and each dir basename.
 func (c *Client) SetURLs(ctx context.Context, dirs []string, name, baseURL string) error {
 	return c.remoteMgr.SetURLs(ctx, dirs, name, baseURL)
 }
diff --git a/client/clienter.go b/client/clienter.go
index fadacb8..1f01ad2 100644
--- a/client/clienter.go
+++ b/client/clienter.go
@@ -8,6 +8,7 @@ import (
 	"github.com/google/go-github/github"
 )
 
+// Clienter is the interface implemented by Client, used to inject fakes in cmd tests.
 type Clienter interface {
 	Add(ctx context.Context, dirs []string, name, baseURL string) error
 	Branches(ctx context.Context, repoDirs []string, args ...string) error
diff --git a/client/context/context.go b/client/context/context.go
index 6a24e52..1d1a8e3 100644
--- a/client/context/context.go
+++ b/client/context/context.go
@@ -1,3 +1,4 @@
+// Package context provides request-scoped state helpers used throughout the align client.
 package context
 
 import (
@@ -17,13 +18,16 @@ var (
 	excludesContextKey reposContext = 1
 	verboseKey                      = verboseContextKey{}
 
+	// ErrReposNotFoundInContext is returned by RepoMap when no repository map has been stored in the context.
 	ErrReposNotFoundInContext = errors.New("repos map not found in context")
 )
 
+// WithVerbose returns a copy of ctx with the verbose flag set.
 func WithVerbose(ctx context.Context, verbose bool) context.Context {
 	return context.WithValue(ctx, verboseKey, verbose)
 }
 
+// Verbose retrieves the verbose flag from ctx, returning false if unset.
 func Verbose(ctx context.Context) bool {
 	v := ctx.Value(verboseKey)
 	verbose, ok := v.(bool)
@@ -33,16 +37,19 @@ func Verbose(ctx context.Context) bool {
 	return verbose
 }
 
+// Repository holds the name and SSH URL of a repository to clone.
 type Repository struct {
 	Name string
 	URL  string
 }
 
+// WithRepos stores the given GitHub repositories as a dir→[]Repository map in ctx.
 func WithRepos(ctx context.Context, repos []*github.Repository) context.Context {
 	repoMap := parseDirRepoMap(repos)
 	return context.WithValue(ctx, reposContextKey, repoMap)
 }
 
+// RepoMap retrieves the directory→repository map from ctx.
 func RepoMap(ctx context.Context) (map[string][]*Repository, error) {
 	v := ctx.Value(reposContextKey)
 	repoMap, ok := v.(map[string][]*Repository)
@@ -52,10 +59,12 @@ func RepoMap(ctx context.Context) (map[string][]*Repository, error) {
 	return repoMap, nil
 }
 
+// WithExcludes stores the repository exclusion list in ctx.
 func WithExcludes(ctx context.Context, repos []*Repository) context.Context {
 	return context.WithValue(ctx, excludesContextKey, repos)
 }
 
+// Excludes retrieves the exclusion list from ctx, returning nil if unset.
 func Excludes(ctx context.Context) ([]*Repository, error) {
 	v := ctx.Value(excludesContextKey)
 	excludes, ok := v.([]*Repository)
@@ -83,6 +92,7 @@ func parseDirRepoMap(repos []*github.Repository) map[string][]*Repository {
 	return dirRepo
 }
 
+// RemoveExcludes returns a copy of repoMap with excluded repositories removed.
 func RemoveExcludes(ctx context.Context, repoMap map[string][]*Repository) (map[string][]*Repository, error) {
 	newMap := map[string][]*Repository{}
 
diff --git a/client/dirs.go b/client/dirs.go
index 361eeee..845a86f 100644
--- a/client/dirs.go
+++ b/client/dirs.go
@@ -7,6 +7,7 @@ import (
 	"path"
 )
 
+// GetDirs returns subdirectories of baseDir that contain a .git directory.
 func (c *Client) GetDirs(ctx context.Context, baseDir string) ([]string, error) {
 	files, err := os.ReadDir(baseDir)
 	if err != nil {
diff --git a/client/repos/diff.go b/client/repos/diff.go
index b1c16b9..3261bc4 100644
--- a/client/repos/diff.go
+++ b/client/repos/diff.go
@@ -10,6 +10,7 @@ import (
 	"strings"
 )
 
+// DiffConfig controls filtering and output options for DiffRepos.
 type DiffConfig struct {
 	IgnoreEmpty      bool
 	IgnoreFilePrefix []string
@@ -17,6 +18,7 @@ type DiffConfig struct {
 	Args             []string
 }
 
+// DiffRepos runs git diff across all dirs using cfg to filter output.
 func (r *Repos) DiffRepos(ctx context.Context, dirs []string, cfg *DiffConfig) error {
 	args := append([]string{"diff"}, cfg.Args...)
 
diff --git a/client/repos/repos.go b/client/repos/repos.go
index 781137b..55c4cc9 100644
--- a/client/repos/repos.go
+++ b/client/repos/repos.go
@@ -1,3 +1,8 @@
+// Package repos implements git operations fanned out across multiple repository directories.
+//
+// The simple fan-out methods (CheckoutRepos, CommitRepos, FetchRepos, MergeRepos, PullRepos,
+// PushRepos, ResetRepos, StageFiles, StashRepos) each prepend their git sub-command and
+// delegate to fanOut. They carry no individual doc comments.
 package repos
 
 import (
@@ -6,12 +11,14 @@ import (
 	"golang.org/x/time/rate"
 )
 
+// Repos holds the scribe, GitHub client, and rate limiter shared by all operations.
 type Repos struct {
 	scrb     scribe.Scriber
 	ghClient *github.Client
 	rate     *rate.Limiter
 }
 
+// New returns a Repos using the provided scribe, GitHub client, and rate limiter.
 func New(scrb scribe.Scriber, ghClient *github.Client, rate *rate.Limiter) *Repos {
 	return &Repos{
 		scrb:     scrb,
diff --git a/config/file.go b/config/file.go
index 959e4e7..eaab0cb 100644
--- a/config/file.go
+++ b/config/file.go
@@ -1,3 +1,4 @@
+// Package config handles reading and writing the align configuration at ~/.align/config.
 package config
 
 import (
@@ -23,19 +24,17 @@ var defaultConfig = Config{
 	},
 }
 
-// Config represents the config file for align
+// Config holds the top-level align configuration read from ~/.align/config.
 type Config struct {
 	Github *GithubHost `yaml:"github.com"`
 }
 
-// New takes a token string and creates the most basic config capable of being
-// written.
+// New returns a minimal Config with the given GitHub token set.
 func New(tkn string) *Config {
 	return &Config{Github: &GithubHost{Token: tkn}}
 }
 
-// WriteFile writes the file to the defined location for the current user, and
-// returns any errors encountered doing so.
+// WriteFile marshals and writes the config to ~/.align/config.
 func (c *Config) WriteFile() error {
 	b, err := yaml.Marshal(c)
 	if err != nil {
diff --git a/config/github.go b/config/github.go
index 8f17f4f..e3634ec 100644
--- a/config/github.go
+++ b/config/github.go
@@ -1,6 +1,6 @@
 package config
 
-// GithubHost represents a single host for which align has a configuration
+// GithubHost holds authentication and rate-limit settings for a GitHub host.
 type GithubHost struct {
 	Token          string  `yaml:"token"`
 	Username       string  `yaml:"username"`
@@ -9,7 +9,7 @@ type GithubHost struct {
 	Limits         *Limits `yaml:"limits"`
 }
 
-// Limits represents a limits override for the client
+// Limits configures GitHub API client request rates.
 type Limits struct {
 	RequestsPerSecond int `yaml:"request_per_second"`
 	Burst             int `yaml:"burst"`
diff --git a/config/parse.go b/config/parse.go
index c7f3888..c768f40 100644
--- a/config/parse.go
+++ b/config/parse.go
@@ -9,8 +9,7 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
-// ParseFromFile reads the align config file from the home directory. It returns
-// any errors it encounters with parsing the file.
+// ParseFromFile reads ~/.align/config, creating the config directory if absent.
 func ParseFromFile() (*Config, error) {
 	usr, err := user.Current()
 	if err != nil {
@@ -54,9 +53,7 @@ func ParseFromFile() (*Config, error) {
 	return &conf, nil
 }
 
-// DirExists returns a bool and error representing whether or not a config
-// directory exists for the current user, and any errors it encounters with
-// statting the existence of the directory.
+// DirExists reports whether the ~/.align config directory exists.
 func DirExists() (bool, error) {
 	usr, err := user.Current()
 	if err != nil {
@@ -74,9 +71,7 @@ func DirExists() (bool, error) {
 	return true, nil
 }
 
-// FileExists returns a bool and error representing whether or not a
-// config file exists for the current user, and any errors it encounters with
-// statting the existence of the file.
+// FileExists reports whether the ~/.align/config file exists.
 func FileExists() (bool, error) {
 	usr, err := user.Current()
 	if err != nil {
@@ -94,8 +89,7 @@ func FileExists() (bool, error) {
 	return true, nil
 }
 
-// CreateDir creates the config directory and all necessary parent directories
-// missing. It returns any error it encounters with creating the directory.
+// CreateDir creates the ~/.align config directory, including any missing parents.
 func CreateDir() error {
 	usr, err := user.Current()
 	if err != nil {