diff --git a/block_section.go b/block_section.go
index 01ffd5a1..0e2cdd3d 100644
--- a/block_section.go
+++ b/block_section.go
@@ -9,6 +9,7 @@ type SectionBlock struct {
 	BlockID   string             `json:"block_id,omitempty"`
 	Fields    []*TextBlockObject `json:"fields,omitempty"`
 	Accessory *Accessory         `json:"accessory,omitempty"`
+	Expand    bool               `json:"expand",omitempty"`
 }
 
 // BlockType returns the type of the block
@@ -25,6 +26,12 @@ func SectionBlockOptionBlockID(blockID string) SectionBlockOption {
 	}
 }
 
+func SectionBlockOptionExpand(expand bool) SectionBlockOption {
+	return func(block *SectionBlock) {
+		block.Expand = expand
+	}
+}
+
 // NewSectionBlock returns a new instance of a section block to be rendered
 func NewSectionBlock(textObj *TextBlockObject, fields []*TextBlockObject, accessory *Accessory, options ...SectionBlockOption) *SectionBlock {
 	block := SectionBlock{