diff --git a/src/main/java/org/bukkit/event/block/BlockFormEvent.java b/src/main/java/org/bukkit/event/block/BlockFormEvent.java
index df0401f1..64af5b0f 100644
--- a/src/main/java/org/bukkit/event/block/BlockFormEvent.java
+++ b/src/main/java/org/bukkit/event/block/BlockFormEvent.java
@@ -15,6 +15,8 @@ import org.bukkit.event.HandlerList;
  * <ul>
  * <li>Snow forming due to a snow storm.
  * <li>Ice forming in a snowy Biome like Taiga or Tundra.
+ * <li> Obsidian / Cobblestone forming due to contact with water.
+ * <li> Concrete forming due to mixing of concrete powder and water.
  * </ul>
  * <p>
  * If a Block Form event is cancelled, the block will not be formed.