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-rw-r--r--lib/northbound.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/northbound.h b/lib/northbound.h
index 40a97dad6b..c5f20d15be 100644
--- a/lib/northbound.h
+++ b/lib/northbound.h
@@ -359,6 +359,10 @@ struct nb_callbacks {
* args
* Refer to the documentation comments of nb_cb_pre_validate_args for
* details.
+ *
+ * Returns:
+ * - NB_OK on success.
+ * - NB_ERR_VALIDATION when a validation error occurred.
*/
int (*pre_validate)(struct nb_cb_pre_validate_args *args);