doc UPDATE function changed
diff --git a/src/plugins_exts.h b/src/plugins_exts.h
index a07cfca..747aa51 100644
--- a/src/plugins_exts.h
+++ b/src/plugins_exts.h
@@ -186,7 +186,7 @@
* This callback is used only for nested data definition (with a standard YANG schema parent).
*
* @param[in] ext Compiled extension instance.
- * @param[in] sibling First sibling parsed by ::lyplg_ext_data_parse_clb.
+ * @param[in] sibling First sibling with schema node returned by ::lyplg_ext_data_snode_clb.
* @param[in] val_opts Validation options, see @ref datavalidationoptions.
* @param[out] diff Optional diff with any changes made by the validation.
* @return LY_SUCCESS on success.