diff --git a/includes/core/class-builtin.php b/includes/core/class-builtin.php
index 47ae9bf2..eeb735cf 100644
--- a/includes/core/class-builtin.php
+++ b/includes/core/class-builtin.php
@@ -196,6 +196,8 @@ if ( ! class_exists( 'um\core\Builtin' ) ) {
 		/**
 		 * Checks for a blacklist function in the custom callback field error.
 		 *
+		 * @since 2.10.4
+		 *
 		 * @param array $args Custom field submission data.
 		 *
 		 * @return int|string Empty or error string.
diff --git a/includes/core/class-fields.php b/includes/core/class-fields.php
index 6ca549b1..7ad67b6f 100644
--- a/includes/core/class-fields.php
+++ b/includes/core/class-fields.php
@@ -1402,6 +1402,16 @@ if ( ! class_exists( 'um\core\Fields' ) ) {
 				$blacklist = array_merge( $blacklist, $um_wp_native_functions_list );
 			}
 
+			/**
+			 * Filters the blacklist of the functions that cannot be used as custom callback for dropdown field to populate the options.
+			 *
+			 * @since 2.5.1
+			 * @hook um_dropdown_options_source_blacklist
+			 *
+			 * @param {array} $blacklist Functions blacklist.
+			 *
+			 * @return {array} Functions blacklist.
+			 */
 			return apply_filters( 'um_dropdown_options_source_blacklist', $blacklist );
 		}