diff --git a/libs/binder/ndk/ibinder.cpp b/libs/binder/ndk/ibinder.cpp
index b1b4194..f16cde6 100644
--- a/libs/binder/ndk/ibinder.cpp
+++ b/libs/binder/ndk/ibinder.cpp
@@ -122,7 +122,7 @@
                               binder_flags_t flags) {
     if (isUserCommand(code)) {
         if (!data.checkInterface(this)) {
-            return STATUS_PERMISSION_DENIED;
+            return STATUS_BAD_TYPE;
         }
 
         const AParcel in = AParcel::readOnly(this, &data);
diff --git a/libs/binder/ndk/include_ndk/android/binder_status.h b/libs/binder/ndk/include_ndk/android/binder_status.h
index d9c36d2..6389a1b 100644
--- a/libs/binder/ndk/include_ndk/android/binder_status.h
+++ b/libs/binder/ndk/include_ndk/android/binder_status.h
@@ -140,7 +140,8 @@
 __attribute__((warn_unused_result)) AStatus* AStatus_fromStatus(binder_status_t status);
 
 /**
- * Whether this object represents a successful transaction.
+ * Whether this object represents a successful transaction. If this function returns true, then
+ * AStatus_getExceptionCode will return EX_NONE.
  */
 bool AStatus_isOk(const AStatus* status);
 
@@ -150,16 +151,18 @@
 binder_exception_t AStatus_getExceptionCode(const AStatus* status);
 
 /**
- * The service specific error if this object represents one. If this object represents a different
- * kind of exception or is ok, this function will return 0. Just because this function returns 0
- * does not mean that the transaction was a success.
+ * The service specific error if this object represents one. This function will only ever return a
+ * non-zero result if AStatus_getExceptionCode returns EX_SERVICE_SPECIFIC. If this function returns
+ * 0, the status object may still represent a different exception or status. To find out if this
+ * transaction as a whole is okay, use AStatus_isOk instead.
  */
 int32_t AStatus_getServiceSpecificError(const AStatus* status);
 
 /**
- * The status if this object represents one. If this object represents a different kind of exception
- * or is ok, this function will return 0. Just because this function returns 0 does not mean that
- * the transaction was a success.
+ * The status if this object represents one. This function will only ever return a non-zero result
+ * if AStatus_getExceptionCode returns EX_TRANSACTION_FAILED. If this function return 0, the status
+ * object may represent a different exception or a service specific error. To find out if this
+ * transaction as a whole is okay, use AStatus_isOk instead.
  */
 binder_status_t AStatus_getStatus(const AStatus* status);