diff --git a/backends/x/event.go b/backends/x/event.go
index 442eff1..74918b8 100644
--- a/backends/x/event.go
+++ b/backends/x/event.go
@@ -113,13 +113,14 @@ func (backend *Backend) handleKeyPress (
 	keyEvent    := *event.KeyPressEvent
 	button, num := backend.keycodeToButton(keyEvent.Detail, keyEvent.State)
 	backend.callbackManager.RunPress (button, stone.Modifiers {
-		// FIXME these may not be correct in all cases
-		Shift:   (keyEvent.State & xproto.ModMaskShift)   > 0,
-		Control: (keyEvent.State & xproto.ModMaskControl) > 0,
-		Alt:     (keyEvent.State & xproto.ModMask1)       > 0,
-		// Meta:    (keyEvent.State & xproto.??)       > 0,
-		Super:   (keyEvent.State & xproto.ModMask4)       > 0,
-		// Hyper:   (keyEvent.State & xproto.??)       > 0,
+		Shift:
+			(keyEvent.State & xproto.ModMaskShift)             > 0 ||
+			(keyEvent.State & backend.modifierMasks.shiftLock) > 0,
+		Control: (keyEvent.State & xproto.ModMaskControl)       > 0,
+		Alt:     (keyEvent.State & backend.modifierMasks.alt)   > 0,
+		Meta:    (keyEvent.State & backend.modifierMasks.meta)  > 0,
+		Super:   (keyEvent.State & backend.modifierMasks.super) > 0,
+		Hyper:   (keyEvent.State & backend.modifierMasks.hyper) > 0,
 		NumberPad: num,
 	})
 }
diff --git a/backends/x/factory.go b/backends/x/factory.go
index 21ff165..b9bdfdf 100644
--- a/backends/x/factory.go
+++ b/backends/x/factory.go
@@ -81,6 +81,11 @@ func factory (
 	backend.modifierMasks.shiftLock  = backend.keysymToMask(0xFFE6)
 	backend.modifierMasks.numLock    = backend.keysymToMask(0xFF7F)
 	backend.modifierMasks.modeSwitch = backend.keysymToMask(0xFF7E)
+	
+	backend.modifierMasks.hyper = backend.keysymToMask(0xffed)
+	backend.modifierMasks.super = backend.keysymToMask(0xffeb)
+	backend.modifierMasks.meta  = backend.keysymToMask(0xffe7)
+	backend.modifierMasks.alt   = backend.keysymToMask(0xffe9)
 
 	// create the window
 	backend.window.Create (
diff --git a/backends/x/x.go b/backends/x/x.go
index 67e764b..a3abf09 100644
--- a/backends/x/x.go
+++ b/backends/x/x.go
@@ -48,6 +48,11 @@ type Backend struct {
 		shiftLock  uint16
 		numLock    uint16
 		modeSwitch uint16
+
+		alt   uint16
+		meta  uint16
+		super uint16
+		hyper uint16
 	}
 
 	windowBoundsClean bool
diff --git a/examples/printbuttons/main.go b/examples/printbuttons/main.go
index 88439f0..cfef8c1 100644
--- a/examples/printbuttons/main.go
+++ b/examples/printbuttons/main.go
@@ -1,6 +1,7 @@
 package main
 
 import "os"
+import "fmt"
 import "image"
 import _ "image/png"
 import "git.tebibyte.media/sashakoshka/stone"
@@ -33,9 +34,18 @@ func main () {
 }
 
 func onPress (button stone.Button, modifiers stone.Modifiers) {
-	println("press", button)
+	fmt.Printf (
+		"=>>\t0x%X\tsh: %t\tctrl: %t\talt: %t\tm: %t\ts: %t \th: %t\tnumpad: %t\n",
+		button,
+		modifiers.Shift,
+		modifiers.Control,
+		modifiers.Alt,
+		modifiers.Meta,
+		modifiers.Super,
+		modifiers.Hyper,
+		modifiers.NumberPad)
 }
 
 func onRelease (button stone.Button) {
-	println("release", button)
+	fmt.Printf("<--\t0x%X\n", button)
 }