diff --git a/src/wp-includes/option.php b/src/wp-includes/option.php
index 6d9fe645c6..842981dd48 100644
--- a/src/wp-includes/option.php
+++ b/src/wp-includes/option.php
@@ -16,6 +16,9 @@
  *
  * If the option was serialized then it will be unserialized when it is returned.
  *
+ * Any scalar values will be returned as strings. You may coerce the return type of a given option by registering a
+ * 'option_{$option}' filter callback.
+ *
  * @since 1.5.0
  *
  * @global wpdb $wpdb WordPress database abstraction object.