diff --git a/scripts/bundle.lua b/scripts/bundle.lua
index 330ae7c575c068fd6cd9fe47594f7a805d933c51..e7d4fcfb4533c561f9b2c061e4cd32b86380d110 100755
--- a/scripts/bundle.lua
+++ b/scripts/bundle.lua
@@ -40,12 +40,14 @@ local function file_exists(path)
 	return false
 end
 
---- Escape string for embedding in Lua long string
+--- Determine appropriate long string delimiters for embedding
 ---@param s string
----@return string
+---@return string open delimiter
+---@return string close delimiter
+---@return string content (unchanged)
 local function escape_for_longstring(s)
 	local level = 0
-	while s:find("%]" .. string.rep("=", level) .. "%]", 1, true) do
+	while s:find("]" .. string.rep("=", level) .. "]", 1, true) do
 		level = level + 1
 	end
 	local open = "[" .. string.rep("=", level) .. "["