diff --git a/timezone.go b/timezone.go
index 22e8a89..0535526 100644
--- a/timezone.go
+++ b/timezone.go
@@ -6,6 +6,9 @@ import (
 	"time"
 )
 
+// TimeZone requests time zone information about a location.
+//
+// See https://developers.google.com/maps/documentation/timezone/
 func (c Client) TimeZone(ll LatLng, t time.Time, opts *TimeZoneOpts) (*TimeZoneResult, error) {
 	var r timeZoneResponse
 	if err := c.doDecode(baseURL+timezone(ll, t, opts), &r); err != nil {
@@ -25,7 +28,11 @@ func timezone(ll LatLng, t time.Time, opts *TimeZoneOpts) string {
 	return "timezone/json?" + p.Encode()
 }
 
+// TimeZoneOpts defines options for TimeZone requests.
 type TimeZoneOpts struct {
+	// The language in which to return results.
+	//
+	// See https://developers.google.com/maps/faq#languagesupport
 	Language string
 }
 
@@ -44,17 +51,33 @@ type timeZoneResponse struct {
 	TimeZoneResult
 }
 
+// TimeZoneResult describes information about the time zone at the requested location.
 type TimeZoneResult struct {
-	DSTOffset    int64  `json:"dstOffset"` // secs offset for DST
-	RawOffset    int64  `json:"rawOffset"`
-	TimeZoneID   string `json:"timeZoneId"`
+	// DSTOffset is the offset for daylight-savings time in seconds.
+	//
+	// This will be zero if the time zone is not in Daylight Savings Time during the specified time.
+	DSTOffset int64 `json:"dstOffset"`
+
+	// RawOffset is the offset from UTC (in seconds) for the given location.
+	//
+	// This does not take into effect daylight savings.
+	RawOffset int64 `json:"rawOffset"`
+
+	// TimeZoneID is a string containing the "tz" ID of the time zone, such as "America/Los_Angeles"
+	TimeZoneID string `json:"timeZoneId"`
+
+	// TimeZoneName is a string containing the long form name of the time zone, e.g., "Pacific Daylight Time".
+	//
+	// This field will be localized if the Language was specified.
 	TimeZoneName string `json:"timeZoneName"`
 }
 
+// DSTOffsetDuration translates the DSTOffset into a time.Duration
 func (r TimeZoneResult) DSTOffsetDuration() time.Duration {
 	return time.Duration(r.DSTOffset) * time.Second
 }
 
+// RawOffsetDuration translates the RawOffset into a time.Duration
 func (r TimeZoneResult) RawOffsetDuration() time.Duration {
 	return time.Duration(r.RawOffset) * time.Second
 }