diff --git a/painter.py b/painter.py
index 435f792..e196f13 100644
--- a/painter.py
+++ b/painter.py
@@ -93,6 +93,14 @@ class Painter(Widget):
                 self.selected=[]
                 self.draw()
 
+            # select all
+            elif keycode[1]=="a":
+                for particle in self.particles:
+                    particle.selected=True
+                self.selected=self.particles.copy()
+                self.unselected=[]
+                self.draw()
+
     def on_key_up(self, keyboard, keycode):
         if keycode[1]=="shift":
             if 's' in self.modifiers: