1 files changed, 50 insertions, 0 deletions

diff --git a/MCServer/Plugins/APIDump/APIDesc.lua b/MCServer/Plugins/APIDump/APIDesc.lua
index e7352beed..cb28b5486 100644
--- a/MCServer/Plugins/APIDump/APIDesc.lua
+++ b/MCServer/Plugins/APIDump/APIDesc.lua
@@ -3051,6 +3051,56 @@ end;
 			]],
 		},  -- HOOK_SPAWNING_MONSTER
 
+		HOOK_UPDATING_SIGN =
+		{
+			CalledWhen = "Before the sign text is updated. Plugin may modify the text / refuse.",
+			DefaultFnName = "OnUpdatingSign",  -- also used as pagename
+			Desc = [[
+				This hook is called when a sign text is about to be updated, either as a result of player's
+				manipulation or any other event, such as a plugin setting the sign text. Plugins may modify the text
+				or refuse the update altogether.</p>
+				<p>
+				See also the {{OnUpdatedSign|HOOK_UPDATED_SIGN}} hook for a similar hook called after the update.
+			]],
+			Params =
+			{
+				{ Name = "World", Type = "{{cWorld}}", Notes = "The world in which the sign resides" },
+				{ Name = "BlockX", Type = "number", Notes = "X-coord of the sign" },
+				{ Name = "BlockY", Type = "number", Notes = "Y-coord of the sign" },
+				{ Name = "BlockZ", Type = "number", Notes = "Z-coord of the sign" },
+				{ Name = "Line1", Type = "string", Notes = "1st line of the new text" },
+				{ Name = "Line2", Type = "string", Notes = "2nd line of the new text" },
+				{ Name = "Line3", Type = "string", Notes = "3rd line of the new text" },
+				{ Name = "Line4", Type = "string", Notes = "4th line of the new text" },
+				{ Name = "Player", Type = "{{cPlayer}}", Notes = "The player who is changing the text. May be nil for non-player updates." }
+			},
+			Returns = [[
+				The function may return up to five values. If the function returns true as the first value, no other
+				callbacks are called for this event and the sign is not updated. If the function returns no value or
+				false as its first value, other plugins' callbacks are called.</p>
+				<p>
+				The other up to four values returned are used to update the sign text, line by line, respectively.
+				Note that other plugins may again update the texts (if the first value returned is false).
+			]],
+			CodeExamples =
+			{
+				{
+					Title = "Add player signature",
+					Desc = "The following example appends a player signature to the last line, if the sign is updated by a player:",
+					Code = [[
+function OnUpdatingSign(World, BlockX, BlockY, BlockZ, Line1, Line2, Line3, Line4, Player)
+	if (Player == nil) then
+		-- Not changed by a player
+		return false;
+	end
+
+	-- Sign with playername, allow other plugins to interfere:
+	return false, Line1, Line2, Line3, Line4 .. Player:GetName();
+end
+					]],
+				}
+			} ,
+		},  -- HOOK_UPDATING_SIGN
 
 		HOOK_WEATHER_CHANGED =
 		{