diff --git a/core/modules/views/src/Plugin/Block/ViewsBlock.php b/core/modules/views/src/Plugin/Block/ViewsBlock.php
index 6578cc6..34116fd 100644
--- a/core/modules/views/src/Plugin/Block/ViewsBlock.php
+++ b/core/modules/views/src/Plugin/Block/ViewsBlock.php
@@ -34,6 +34,9 @@ public function build() {
 
       if (!empty($this->context[$argument_name])) {
         if ($value = $this->context[$argument_name]->getContextValue()) {
+
+          // Context values are often entities, but views arguments expect to
+          // receive just the entity ID, convert it.
           if ($value instanceof EntityInterface) {
             $value = $value->id();
           }