diff --git a/KeyStorage.h b/KeyStorage.h
index 5228f08..1eb26ae 100644
--- a/KeyStorage.h
+++ b/KeyStorage.h
@@ -61,20 +61,7 @@
                         const KeyAuthentication& auth, const KeyBuffer& key);
 
 // Retrieve the key from the named directory.
-//
-// If the key is wrapped by a Keymaster key that requires an upgrade, then that
-// Keymaster key is upgraded.  If |keepOld| is false, then the upgraded
-// Keymaster key replaces the original one.  As part of this, the original is
-// deleted from Keymaster; however, if a user data checkpoint is active, this
-// part is delayed until the checkpoint is committed.
-//
-// If instead |keepOld| is true, then the upgraded key doesn't actually replace
-// the original one.  This is needed *only* if |dir| isn't located in /data and
-// a user data checkpoint is active.  In this case the caller must handle
-// replacing the original key if the checkpoint is committed, and deleting the
-// upgraded key if the checkpoint is rolled back.
-bool retrieveKey(const std::string& dir, const KeyAuthentication& auth, KeyBuffer* key,
-                 bool keepOld);
+bool retrieveKey(const std::string& dir, const KeyAuthentication& auth, KeyBuffer* key);
 
 // Securely destroy the key stored in the named directory and delete the directory.
 bool destroyKey(const std::string& dir);