diff --git a/odit.sublime-project b/odit.sublime-project
index 9c95cc8..e50f18e 100644
--- a/odit.sublime-project
+++ b/odit.sublime-project
@@ -12,7 +12,7 @@
 	],
 	"build_systems": [
 		{
-			"cmd": ["odin", "build", "src", "-debug"],
+			"cmd": ["odin", "build", "src", "-debug", "-o:none"],
 			"name": "odit",
 			"selector": "source.odin",
 			"working_dir": "${project_path}"
diff --git a/src/main.odin b/src/main.odin
index b12b8a2..edb0150 100644
--- a/src/main.odin
+++ b/src/main.odin
@@ -2,7 +2,7 @@
 - DONE implement movement up and down by paragraph
 - DONE implement scrolling/viewport
 - DONE implement deletion by word
-- TODO implement selection
+- DONE implement selection
 - TODO implement duplicate selection/line
 - TODO implement move selection/line up/down
 - TODO implement copy/cut/paste
@@ -16,6 +16,7 @@ package main
 import "core:fmt"
 import "core:mem"
 import "core:os"
+import "core:slice"
 import "core:strings"
 import utf8 "core:unicode/utf8"
 import r "vendor:raylib"
@@ -129,6 +130,21 @@ main :: proc() {
 			fmt.println("Wrote file!")
 		}
 
+		if r.IsKeyDown(.LEFT_SUPER) && r.IsKeyDown(.LEFT_SHIFT) && r.IsKeyPressed(.D) {
+			if selection.active {
+				earliest := selection_earliest()
+				latest := selection_latest()
+				#reverse for line, index in lines[earliest.line:latest.line + 1] {
+					new_line, _ := slice.clone_to_dynamic(line[:])
+					inject_at(&lines, latest.line + 1, new_line)
+				}
+				// NOTE: should we move the selection as well?
+			} else {
+				new_line, _ := slice.clone_to_dynamic(current_line()[:])
+				inject_at(&lines, cursor.line + 1, new_line)
+				cursor.line += 1
+			}
+		}
 
 		cursor_padding := 3
 		// move viewport up