diff --git a/libteec/include/tee_client_api.h b/libteec/include/tee_client_api.h
index 74dd2d5d..10ebb69c 100644
--- a/libteec/include/tee_client_api.h
+++ b/libteec/include/tee_client_api.h
@@ -160,10 +160,14 @@ extern "C" {
  * TEE_ERROR_EXTERNAL_CANCEL    Defined by the Trusted User Interface
  *                              specification: An external event has caused a
  *                              User Interface operation to be aborted.
+ * TEEC_ERROR_EXTERNAL_CANCEL   Deprecated: not specified in client API, use
+ *                              TEE_ERROR_EXTERNAL_CANCEL intead.
  * TEE_ERROR_OVERFLOW           Internal TEE error – documented for completeness
  * TEE_ERROR_TARGET_DEAD        The Trusted Application has terminated.
  * TEEC_ERROR_TARGET_DEAD       The Trusted Application has terminated.
  * TEE_ERROR_STORAGE_NO_SPACE   Internal TEE error – documented for completeness
+ * TEEC_ERROR_STORAGE_NO_SPACE  Deprecated: not specified in client API, use
+ *                              TEE_ERROR_STORAGE_NO_SPACE instead.
  * TEE_ERROR_MAC_INVALID        Internal TEE error – documented for completeness
  * TEE_ERROR_SIGNATURE_INVALID  Internal TEE error – documented for completeness
  * TEE_ERROR_TIME_NOT_SET       Internal TEE error – documented for completeness