diff --git a/MCServer/Plugins/APIDump/APIDesc.lua b/MCServer/Plugins/APIDump/APIDesc.lua
index 74e7bf860..92b57865f 100644
--- a/MCServer/Plugins/APIDump/APIDesc.lua
+++ b/MCServer/Plugins/APIDump/APIDesc.lua
@@ -1826,6 +1826,7 @@ cPluginManager.AddHook(cPluginManager.HOOK_CHAT, OnChatMessage);
 			},
 			Constants =
 			{
+				HOOK_BLOCK_SPREAD = { Notes = "Called when a block spreads based on world conditions" },
 				HOOK_BLOCK_TO_PICKUPS = { Notes = "Called when a block has been dug and is being converted to pickups. The server has provided the default pickups and the plugins may modify them." },
 				HOOK_CHAT = { Notes = "Called when a client sends a chat message that is not a command. The plugin may modify the chat message" },
 				HOOK_CHUNK_AVAILABLE = { Notes = "Called when a chunk is loaded or generated and becomes available in the {{cWorld|world}}." },
@@ -2767,6 +2768,14 @@ end
 						data provided with the explosions, such as the exploding {{cCreeper|creeper}} entity or the
 						{{Vector3i|coords}} of the exploding bed.
 					]],
+				},
+				SpreadSource =
+				{
+					Include = "^es.*",
+					TextBefore = [[
+						These constants are used to differentiate the various sources of spreads. They are used in
+						the {{OnBlockSpread|HOOK_BLOCK_SPREAD}} hook.
+					]],
 				}
 			},
 		},  -- Globals
diff --git a/MCServer/Plugins/APIDump/Hooks/OnBlockSpread.lua b/MCServer/Plugins/APIDump/Hooks/OnBlockSpread.lua
new file mode 100644
index 000000000..1dde55f36
--- /dev/null
+++ b/MCServer/Plugins/APIDump/Hooks/OnBlockSpread.lua
@@ -0,0 +1,40 @@
+return
+{
+	HOOK_BLOCK_SPREAD =
+	{
+		CalledWhen = "Called when a block spreads based on world conditions",
+		DefaultFnName = "OnBlockSpread",  -- also used as pagename
+		Desc = [[
+			This hook is called when a block spreads.</p>
+			<p>
+			The explosion carries with it the type of its source - whether it's a creeper exploding, or TNT,
+			etc. It also carries the identification of the actual source. The exact type of the identification
+			depends on the source kind:
+			<table>
+			<tr><th>Source</th><th>Notes</th></tr>
+			<tr><td>esFireSpread</td><td>Fire spreading</td></tr>
+			<tr><td>esGrassSpread</td><td>Grass spreading</td></tr>
+			<tr><td>esMushroomSpread</td><td>Mushroom spreading</td></tr>
+			<tr><td>esMycelSpread</td><td>Mycel spreading</td></tr>
+			<tr><td>esVineSpread</td><td>Vine spreading</td></tr>
+			</table></p>
+		]],
+		Params =
+		{
+			{ Name = "World", Type = "{{cWorld}}", Notes = "The world in which the block resides" },
+			{ Name = "BlockX", Type = "number", Notes = "X-coord of the block" },
+			{ Name = "BlockY", Type = "number", Notes = "Y-coord of the block" },
+			{ Name = "BlockZ", Type = "number", Notes = "Z-coord of the block" },
+			{ Name = "Source", Type = "eSpreadSource", Notes = "Source of the spread. See the table above." },
+		},
+		Returns = [[
+			If the function returns false or no value, the next plugin's callback is called, and finally
+			MCServer will process the spread. If the function
+			returns true, no other callback is called for this event and the spread will not occur.
+		]],
+	},  -- HOOK_BLOCK_SPREAD
+}
+
+
+
+