diff --git a/biometrics/face/1.0/types.hal b/biometrics/face/1.0/types.hal
index 2628af9..f6827d5 100644
--- a/biometrics/face/1.0/types.hal
+++ b/biometrics/face/1.0/types.hal
@@ -245,9 +245,22 @@
     RECALIBRATE = 13,
 
     /**
+     * The face is too different from a previous acquisition. This condition
+     * only applies to enrollment. This can happen if the user passes the
+     * device to someone else in the middle of enrollment.
+     */
+    TOO_DIFFERENT = 14,
+
+    /**
+     * The face is too similar to a previous acquisition. This condition only
+     * applies to enrollment. The user should change their pose.
+     */
+    TOO_SIMILAR = 15,
+
+    /**
      * Used to enable a vendor-specific acquisition message.
      */
-    VENDOR = 14
+    VENDOR = 16
 };
 
 /**