diff --git a/neuralnetworks/1.2/types.hal b/neuralnetworks/1.2/types.hal
index 61970f0..fc2b540 100644
--- a/neuralnetworks/1.2/types.hal
+++ b/neuralnetworks/1.2/types.hal
@@ -26,7 +26,9 @@
  * The type of an operation in a model.
  */
 enum OperationType : @1.1::OperationType {
-
+    // TODO: Sync docs.
+    ARGMAX = 38,
+    ARGMIN = 39,
 };
 
 /**