diff --git a/API.md b/API.md
index 99ddc21..24de94b 100644
--- a/API.md
+++ b/API.md
@@ -4,6 +4,9 @@
 
 #### `i3.new_tab(name, def)`
 
+- `name` is the tab name.
+- `def` is the tab definition.
+
 Custom tabs can be added to the `i3` inventory as follow (example):
 
 ```Lua
@@ -238,17 +241,17 @@ A map of search filters, indexed by name.
 
 Sorting methods are used to filter the player's main inventory.
 
-#### `i3.add_sorting_method(def)`
+#### `i3.add_sorting_method(name, def)`
 
 Adds a player inventory sorting method.
 
+- `name` is the method name.
 - `def` is the method definition.
 
 Example:
 
 ```Lua
-i3.add_sorting_method {
-	name = "test",
+i3.add_sorting_method("test", {
 	description = "Cool sorting method",
 	func = function(list, data)
 		-- `list`: inventory list
@@ -259,7 +262,7 @@ i3.add_sorting_method {
 		-- A list must be returned
 		return list
 	end,
-}
+})
 
 ```
 
diff --git a/src/api.lua b/src/api.lua
index 87c1c1b..4bf266e 100644
--- a/src/api.lua
+++ b/src/api.lua
@@ -298,32 +298,31 @@ function i3.compress(item, def)
 	end
 end
 
-function i3.add_sorting_method(def)
-	if not true_table(def) then
-		return err "i3.add_sorting_method: definition missing"
-	elseif not true_str(def.name) then
+function i3.add_sorting_method(name, def)
+	if not true_str(name) then
 		return err "i3.add_sorting_method: name missing"
+	elseif not true_table(def) then
+		return err "i3.add_sorting_method: definition missing"
 	elseif not is_func(def.func) then
 		return err "i3.add_sorting_method: function missing"
 	end
 
+	def.name = name
 	insert(i3.sorting_methods, def)
 end
 
-i3.add_sorting_method {
-	name = "alphabetical",
+i3.add_sorting_method("alphabetical", {
 	description = S"Sort items by name (A-Z)",
 	func = function(list, data)
 		sorter(list, data.reverse_sorting, 1)
 		return list
 	end
-}
+})
 
-i3.add_sorting_method {
-	name = "numerical",
+i3.add_sorting_method("numerical", {
 	description = S"Sort items by number of items per stack",
 	func = function(list, data)
 		sorter(list, data.reverse_sorting, 2)
 		return list
 	end,
-}
+})
diff --git a/src/gui.lua b/src/gui.lua
index c873b72..7205cc7 100644
--- a/src/gui.lua
+++ b/src/gui.lua
@@ -475,7 +475,7 @@ local function show_popup(fs, data)
 			fs("image_button", 7.65, 10.6, 0.35, 0.35, "", "next_sort", "")
 
 			fs("style[sort_method;font=bold;font_size=20]")
-			fs("button", 2.55, 10.36, 5.1, 0.8, "sort_method", data.sort:gsub("^%l", upper))
+			fs("button", 2.55, 10.36, 5.1, 0.8, "sort_method", toupper(data.sort))
 
 			local idx = get_sorting_idx(data.sort)
 			local desc = i3.sorting_methods[idx].description