1 files changed, 4 insertions, 0 deletions
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardHostViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardHostViewController.java
index 3ebd652b3467..598325ce44f3 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardHostViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardHostViewController.java
@@ -320,6 +320,10 @@ public class KeyguardHostViewController extends ViewController<KeyguardHostView>
         mKeyguardSecurityContainerController.showPrimarySecurityScreen(false);
     }
 
+    /**
+     * Fades and translates in/out the security screen.
+     * @param fraction amount of the screen that should show.
+     */
     public void setExpansion(float fraction) {
         float alpha = MathUtils.map(KeyguardBouncer.ALPHA_EXPANSION_THRESHOLD, 1, 1, 0, fraction);
         mView.setAlpha(MathUtils.constrain(alpha, 0f, 1f));