diff --git a/README.md b/README.md
index 702dea3..0052ef5 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,12 @@
 # Garmin Connect Go Client
 
+[![Go Reference](https://pkg.go.dev/badge/github.com/sstent/go-garth/pkg/garmin.svg)](https://pkg.go.dev/github.com/sstent/go-garth/pkg/garmin)
+
 Go port of the Garth Python library for accessing Garmin Connect data. Provides full API coverage with improved performance and type safety.
 
 ## Installation
 ```bash
-go get github.com/sstent/garmin-connect/garth
+go get github.com/sstent/go-garth/pkg/garmin
 ```
 
 ## Basic Usage
@@ -14,12 +16,12 @@ package main
 import (
 	"fmt"
 	"time"
-	"garmin-connect/garth"
+	"github.com/sstent/go-garth/pkg/garmin"
 )
 
 func main() {
 	// Create client and authenticate
-	client, err := garth.NewClient("garmin.com")
+	client, err := garmin.NewClient("garmin.com")
 	if err != nil {
 		panic(err)
 	}
@@ -29,9 +31,9 @@ func main() {
 		panic(err)
 	}
 
-	// Get yesterday's body battery data
+	// Get yesterday's body battery data (detailed)
 	yesterday := time.Now().AddDate(0, 0, -1)
-	bb, err := garth.BodyBatteryData{}.Get(yesterday, client)
+	bb, err := client.GetBodyBatteryData(yesterday)
 	if err != nil {
 		panic(err)
 	}
@@ -41,16 +43,16 @@ func main() {
 	}
 
 	// Get weekly steps
-	steps := garth.NewDailySteps()
+	steps := garmin.NewDailySteps()
 	stepData, err := steps.List(time.Now(), 7, client)
 	if err != nil {
 		panic(err)
 	}
 	
 	for _, s := range stepData {
-		fmt.Printf("%s: %d steps\n", 
-			s.(garth.DailySteps).CalendarDate.Format("2006-01-02"),
-			*s.(garth.DailySteps).TotalSteps)
+		fmt.Printf("%s: %d steps\n",
+			s.(garmin.DailySteps).CalendarDate.Format("2006-01-02"),
+			*s.(garmin.DailySteps).TotalSteps)
 	}
 }
 ```
@@ -102,7 +104,7 @@ BenchmarkSleepList-8         	   50000	     35124 ns/op (7 days)
 ```
 
 ## Documentation
-Full API docs: [https://pkg.go.dev/garmin-connect/garth](https://pkg.go.dev/garmin-connect/garth)
+Full API docs: [https://pkg.go.dev/github.com/sstent/go-garth/pkg/garmin](https://pkg.go.dev/github.com/sstent/go-garth/pkg/garmin)
 
 ## CLI Tool
 Includes `cmd/garth` CLI for data export. Supports both daily and weekly stats:
diff --git a/internal/api/client/doc.go b/internal/api/client/doc.go
new file mode 100644
index 0000000..be09fbf
--- /dev/null
+++ b/internal/api/client/doc.go
@@ -0,0 +1,6 @@
+// Package client implements the low-level Garmin Connect HTTP client.
+// It is responsible for authentication (via SSO helpers), request construction,
+// header and cookie handling, error mapping, and JSON decoding. Higher-level
+// public APIs in pkg/garmin delegate to this package for actual network I/O.
+// Note: This is an internal package and not intended for direct external use.
+package client
diff --git a/internal/auth/credentials/credentials.go b/internal/auth/credentials/credentials.go
index df27b1a..70f1f01 100644
--- a/internal/auth/credentials/credentials.go
+++ b/internal/auth/credentials/credentials.go
@@ -11,7 +11,7 @@ import (
 // LoadEnvCredentials loads credentials from .env file
 func LoadEnvCredentials() (email, password, domain string, err error) {
 	// Determine project root (assuming .env is in the project root)
-	projectRoot := "/home/sstent/Projects/github.com/sstent/go-garth"
+	projectRoot := "/home/sstent/Projects/go-garth"
 	envPath := filepath.Join(projectRoot, ".env")
 
 	// Load .env file
@@ -34,4 +34,4 @@ func LoadEnvCredentials() (email, password, domain string, err error) {
 	}
 
 	return email, password, domain, nil
-}
\ No newline at end of file
+}
diff --git a/internal/auth/credentials/doc.go b/internal/auth/credentials/doc.go
new file mode 100644
index 0000000..b84678d
--- /dev/null
+++ b/internal/auth/credentials/doc.go
@@ -0,0 +1,4 @@
+// Package credentials provides helpers for loading user credentials and
+// environment configuration used during authentication and local development.
+// Note: This is an internal package and not intended for direct external use.
+package credentials
diff --git a/internal/auth/oauth/doc.go b/internal/auth/oauth/doc.go
new file mode 100644
index 0000000..0f89792
--- /dev/null
+++ b/internal/auth/oauth/doc.go
@@ -0,0 +1,5 @@
+// Package oauth contains low-level OAuth1 and OAuth2 flows used by SSO to
+// obtain and exchange tokens. It handles request signing, headers, and response
+// parsing to produce strongly-typed token structures for the client.
+// Note: This is an internal package and not intended for direct external use.
+package oauth
diff --git a/internal/auth/sso/doc.go b/internal/auth/sso/doc.go
new file mode 100644
index 0000000..bd5308b
--- /dev/null
+++ b/internal/auth/sso/doc.go
@@ -0,0 +1,5 @@
+// Package sso implements the Garmin SSO login flow. It orchestrates CSRF,
+// ticket exchange, MFA placeholders, and token retrieval, delegating OAuth
+// details to internal/auth/oauth. The internal client consumes this package.
+// Note: This is an internal package and not intended for direct external use.
+package sso
diff --git a/internal/config/doc.go b/internal/config/doc.go
new file mode 100644
index 0000000..afae927
--- /dev/null
+++ b/internal/config/doc.go
@@ -0,0 +1,5 @@
+// Package config defines the application configuration schema and helpers for
+// locating, loading, saving, and initializing configuration files following
+// conventional XDG directory layout.
+// Note: This is an internal package and not intended for direct external use.
+package config
diff --git a/internal/data/doc.go b/internal/data/doc.go
new file mode 100644
index 0000000..f05620d
--- /dev/null
+++ b/internal/data/doc.go
@@ -0,0 +1,5 @@
+// Package data provides helpers and enrichments for Garmin wellness and metric
+// data. It includes parsing utilities, convenience wrappers that add methods to
+// decoded responses, and transformations used by higher-level APIs.
+// Note: This is an internal package and not intended for direct external use.
+package data
diff --git a/internal/errors/doc.go b/internal/errors/doc.go
new file mode 100644
index 0000000..e3629c9
--- /dev/null
+++ b/internal/errors/doc.go
@@ -0,0 +1,5 @@
+// Package errors defines structured error types used across the module,
+// including APIError, IOError, AuthenticationError, OAuthError, and
+// ValidationError. These implement error wrapping and preserve HTTP context.
+// Note: This is an internal package and not intended for direct external use.
+package errors
diff --git a/internal/models/types/doc.go b/internal/models/types/doc.go
new file mode 100644
index 0000000..565b34b
--- /dev/null
+++ b/internal/models/types/doc.go
@@ -0,0 +1,5 @@
+// Package types defines core domain models mapped to Garmin Connect API JSON.
+// It includes user profile, wellness metrics, sleep detail, HRV, body battery,
+// training status/load, time helpers, and related structures.
+// Note: This is an internal package and not intended for direct external use.
+package types
diff --git a/internal/models/types/garmin.go b/internal/models/types/garmin.go
index de7d785..237ea52 100644
--- a/internal/models/types/garmin.go
+++ b/internal/models/types/garmin.go
@@ -70,6 +70,7 @@ func (gt *GarminTime) UnmarshalJSON(b []byte) (err error) {
 	// If the input string does not contain 'Z', it will be parsed as local time.
 	// For consistency, we'll assume UTC if no timezone is specified.
 	layouts := []string{
+		"2006-01-02 15:04:05",   // Example: 2025-09-21 07:18:03
 		"2006-01-02T15:04:05.0", // Example: 2018-09-01T00:13:25.0
 		"2006-01-02T15:04:05",   // Example: 2018-09-01T00:13:25
 		"2006-01-02",            // Example: 2018-09-01
diff --git a/internal/models/types/garmin_test.go b/internal/models/types/garmin_test.go
new file mode 100644
index 0000000..62e066f
--- /dev/null
+++ b/internal/models/types/garmin_test.go
@@ -0,0 +1,82 @@
+package types
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+)
+
+func TestGarminTime_UnmarshalJSON(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		expected time.Time
+		wantErr  bool
+	}{
+		{
+			name:     "space separated format",
+			input:    `"2025-09-21 07:18:03"`,
+			expected: time.Date(2025, 9, 21, 7, 18, 3, 0, time.UTC),
+			wantErr:  false,
+		},
+		{
+			name:     "T separator with milliseconds",
+			input:    `"2018-09-01T00:13:25.0"`,
+			expected: time.Date(2018, 9, 1, 0, 13, 25, 0, time.UTC),
+			wantErr:  false,
+		},
+		{
+			name:     "T separator without milliseconds",
+			input:    `"2018-09-01T00:13:25"`,
+			expected: time.Date(2018, 9, 1, 0, 13, 25, 0, time.UTC),
+			wantErr:  false,
+		},
+		{
+			name:     "date only",
+			input:    `"2018-09-01"`,
+			expected: time.Date(2018, 9, 1, 0, 0, 0, 0, time.UTC),
+			wantErr:  false,
+		},
+		{
+			name:    "invalid format",
+			input:   `"invalid"`,
+			wantErr: true,
+		},
+		{
+			name:    "null value",
+			input:   "null",
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var gt GarminTime
+			err := json.Unmarshal([]byte(tt.input), &gt)
+
+			if tt.wantErr {
+				if err == nil {
+					t.Errorf("expected error but got none")
+				}
+				return
+			}
+
+			if err != nil {
+				t.Errorf("unexpected error: %v", err)
+				return
+			}
+
+			if tt.input == "null" {
+				// For null values, the time should be zero
+				if !gt.Time.IsZero() {
+					t.Errorf("expected zero time for null input, got %v", gt.Time)
+				}
+				return
+			}
+
+			if !gt.Time.Equal(tt.expected) {
+				t.Errorf("expected %v, got %v", tt.expected, gt.Time)
+			}
+		})
+	}
+}
diff --git a/internal/stats/doc.go b/internal/stats/doc.go
new file mode 100644
index 0000000..f37070b
--- /dev/null
+++ b/internal/stats/doc.go
@@ -0,0 +1,5 @@
+// Package stats provides typed accessors for aggregated statistics endpoints,
+// including daily and weekly variants for steps, stress, hydration, sleep, HRV,
+// and intensity minutes. Pagination and date-window logic live here.
+// Note: This is an internal package and not intended for direct external use.
+package stats
diff --git a/internal/testutils/doc.go b/internal/testutils/doc.go
new file mode 100644
index 0000000..af21121
--- /dev/null
+++ b/internal/testutils/doc.go
@@ -0,0 +1,4 @@
+// Package testutils contains helpers for tests such as HTTP servers and mock
+// clients. It is used by unit and integration tests within this repository.
+// Note: This is an internal package and not intended for direct external use.
+package testutils
diff --git a/internal/users/doc.go b/internal/users/doc.go
new file mode 100644
index 0000000..26b6c2f
--- /dev/null
+++ b/internal/users/doc.go
@@ -0,0 +1,4 @@
+// Package users contains structures related to user settings and sleep windows.
+// It mirrors selected Garmin user profile payloads used in feature logic.
+// Note: This is an internal package and not intended for direct external use.
+package users
diff --git a/internal/utils/doc.go b/internal/utils/doc.go
new file mode 100644
index 0000000..d01ec63
--- /dev/null
+++ b/internal/utils/doc.go
@@ -0,0 +1,4 @@
+// Package utils provides general helpers such as OAuth signing utilities,
+// time conversions, date range helpers, and string case conversions.
+// Note: This is an internal package and not intended for direct external use.
+package utils
diff --git a/pkg/auth/oauth/doc.go b/pkg/auth/oauth/doc.go
new file mode 100644
index 0000000..3ab3abc
--- /dev/null
+++ b/pkg/auth/oauth/doc.go
@@ -0,0 +1,6 @@
+// Package oauth provides public wrappers around the internal OAuth helpers.
+// It exposes functions to obtain OAuth1 tokens and exchange them for OAuth2
+// tokens compatible with the public garmin package types. External consumers
+// should use this package when they need token bootstrapping independent of
+// a fully initialized client.
+package oauth
diff --git a/pkg/garmin/health.go b/pkg/garmin/health.go
index 78cc41a..293fad4 100644
--- a/pkg/garmin/health.go
+++ b/pkg/garmin/health.go
@@ -9,6 +9,8 @@ import (
 	"github.com/sstent/go-garth/internal/models/types"
 )
 
+// GetDailyHRVData retrieves comprehensive daily HRV data for the given date.
+// It returns nil when no HRV data is available for the specified day.
 func (c *Client) GetDailyHRVData(date time.Time) (*types.DailyHRVData, error) {
 	return getDailyHRVData(date, c.Client)
 }
@@ -41,6 +43,9 @@ func getDailyHRVData(day time.Time, client *internalClient.Client) (*types.Daily
 	return &response.HRVSummary, nil
 }
 
+// GetDetailedSleepData retrieves comprehensive sleep data for the given date,
+// including sleep stages and movement where available. It returns nil when no
+// sleep data is available for the specified day.
 func (c *Client) GetDetailedSleepData(date time.Time) (*types.DetailedSleepData, error) {
 	return getDetailedSleepData(date, c.Client)
 }
diff --git a/shared/interfaces/doc.go b/shared/interfaces/doc.go
new file mode 100644
index 0000000..b62a0f7
--- /dev/null
+++ b/shared/interfaces/doc.go
@@ -0,0 +1,4 @@
+// Package interfaces defines narrow contracts shared across packages.
+// Notably, APIClient abstracts HTTP access required by data and stats layers,
+// and BaseData/Data define the concurrent day-by-day retrieval pattern.
+package interfaces
diff --git a/shared/models/doc.go b/shared/models/doc.go
new file mode 100644
index 0000000..05d2e70
--- /dev/null
+++ b/shared/models/doc.go
@@ -0,0 +1,4 @@
+// Package models defines shared data models that are safe to expose to public
+// packages, including user settings and related sub-structures consumed by
+// both internal client code and public wrappers.
+package models