diff --git a/builder/query/scan.go b/builder/query/scan.go
index 3c1153f..3029a24 100644
--- a/builder/query/scan.go
+++ b/builder/query/scan.go
@@ -16,6 +16,8 @@ const (
 	None             = "NONE"
 )
 
+// Scan query returns raw Apache Druid rows in streaming mode.
+// https://druid.apache.org/docs/latest/querying/scan-query.html
 type Scan struct {
 	Base
 	VirtualColumns []builder.VirtualColumn `json:"virtualColumns,omitempty"`
@@ -29,72 +31,98 @@ type Scan struct {
 	Legacy         bool                    `json:"legacy,omitempty"`
 }
 
+// NewScan returns *builder.Scan which can be used to build a scan query.
+// Eg,
+//		table := datasource.NewTable().SetName("table-name")
+//
+//		now := time.Now()
+//		i := intervals.NewInterval().SetInterval(now.Add(-60*time.Minute), now)
+//		is := intervals.NewIntervals().SetIntervals([]*intervals.Interval{i})
+//
+//		filter1 := filter.NewSelector().SetDimension("key1").SetValue("val1")
+//		filter2 := filter.NewSelector().SetDimension("key2").SetValue("val2")
+//		filters := filter.NewAnd().SetFields([]builder.Filter{filter1, filter2})
+//
+//		ts := query.NewScan().SetDataSource(table).SetIntervals(is).SetFilter(filters).SetResultFormat("compactedList").SetLimit(10)
 func NewScan() *Scan {
 	s := &Scan{}
 	s.Base.SetQueryType("scan")
 	return s
 }
 
+// SetDataSource sets data source.
 func (s *Scan) SetDataSource(dataSource builder.DataSource) *Scan {
 	s.Base.SetDataSource(dataSource)
 	return s
 }
 
+// SetIntervals set the intervals.
 func (s *Scan) SetIntervals(intervals builder.Intervals) *Scan {
 	s.Base.SetIntervals(intervals)
 	return s
 }
 
+// SetContext sets the context.
 func (s *Scan) SetContext(context map[string]interface{}) *Scan {
 	s.Base.SetContext(context)
 	return s
 }
 
+// SetVirtualColumns sets virtual columns.
 func (s *Scan) SetVirtualColumns(virtualColumns []builder.VirtualColumn) *Scan {
 	s.VirtualColumns = virtualColumns
 	return s
 }
 
+// SetResultFormat sets the result format.
 func (s *Scan) SetResultFormat(resultFormat string) *Scan {
 	s.ResultFormat = resultFormat
 	return s
 }
 
+// SetBatchSize sets the batch size.
 func (s *Scan) SetBatchSize(batchSize int64) *Scan {
 	s.BatchSize = batchSize
 	return s
 }
 
+// SetLimit sets the limit.
 func (s *Scan) SetLimit(limit int64) *Scan {
 	s.Limit = limit
 	return s
 }
 
+// SetOffset sets the offset.
 func (s *Scan) SetOffset(offset int64) *Scan {
 	s.Offset = offset
 	return s
 }
 
+// SetOrder sets the order.
 func (s *Scan) SetOrder(order Order) *Scan {
 	s.Order = order
 	return s
 }
 
+// SetFilter sets the filter.
 func (s *Scan) SetFilter(filter builder.Filter) *Scan {
 	s.Filter = filter
 	return s
 }
 
+// SetColumns set columns.
 func (s *Scan) SetColumns(columns []string) *Scan {
 	s.Columns = columns
 	return s
 }
 
+// SetLegacy sets the `druid.query.scan.legacy` field.
 func (s *Scan) SetLegacy(legacy bool) *Scan {
 	s.Legacy = legacy
 	return s
 }
 
+// UnmarshalJSON unmarshalls a druid scan native query json string into builder type.
 func (s *Scan) UnmarshalJSON(data []byte) error {
 	var err error
 	var tmp struct {
diff --git a/go.mod b/go.mod
index bc8c685..0d8faa8 100644
--- a/go.mod
+++ b/go.mod
@@ -7,5 +7,4 @@ require (
 	github.com/google/go-querystring v1.0.0
 	github.com/hashicorp/go-retryablehttp v0.6.7
 	github.com/stretchr/testify v1.2.2
-	golang.org/x/tools v0.1.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 2464bab..f3d8a04 100644
--- a/go.sum
+++ b/go.sum
@@ -1,69 +1,14 @@
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/go-querystring v1.0.0 h1:Xkwi/a1rcvNg1PPYe5vI8GbeBY/jrVuDX5ASuANWTrk=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
-github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
-github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/go-cleanhttp v0.5.1 h1:dH3aiDG9Jvb5r5+bYHsikaOUIpcM0xvgMXVoDkXMzJM=
 github.com/hashicorp/go-cleanhttp v0.5.1/go.mod h1:JpRdi6/HCYpAwUzNwuwqhbovhLtngrth3wmdIIUrZ80=
 github.com/hashicorp/go-hclog v0.9.2 h1:CG6TE5H9/JXsFWJCfoIVpKFIkFe6ysEuHirp4DxCsHI=
 github.com/hashicorp/go-hclog v0.9.2/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrjA0H7acj2lQ=
 github.com/hashicorp/go-retryablehttp v0.6.7 h1:8/CAEZt/+F7kR7GevNHulKkUjLht3CPmn7egmhieNKo=
 github.com/hashicorp/go-retryablehttp v0.6.7/go.mod h1:vAew36LZh98gCBJNLH42IQ1ER/9wtLZZ8meHqQvEYWY=
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 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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 github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
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