diff --git a/src/event/block/BlockFormEvent.php b/src/event/block/BlockFormEvent.php
index 7027d572a..f955319c0 100644
--- a/src/event/block/BlockFormEvent.php
+++ b/src/event/block/BlockFormEvent.php
@@ -23,6 +23,10 @@ declare(strict_types=1);
 
 namespace pocketmine\event\block;
 
+/**
+ * Called when a new block forms, usually as the result of some action.
+ * This could be things like obsidian forming due to collision of lava and water.
+ */
 class BlockFormEvent extends BaseBlockChangeEvent{
 
 }