diff --git a/cf-lib/changelog.txt b/cf-lib/changelog.txt
index a8ccbc2..f658edc 100644
--- a/cf-lib/changelog.txt
+++ b/cf-lib/changelog.txt
@@ -1,4 +1,15 @@
 ---------------------------------------------------------------------------------------------------
+Version: 1.4.0
+Date: 10.01.2026
+  Changes:
+    - Add Entity.setFilename
+---------------------------------------------------------------------------------------------------
+Version: 1.3.0
+Date: 24.12.2025
+  Changes:
+    - :apply() returns self
+    - Add Recipe:addIndicatorIcon()
+---------------------------------------------------------------------------------------------------
 Version: 1.2.0
 Date: 14.12.2025
   Changes:
diff --git a/cf-lib/data/Entity.lua b/cf-lib/data/Entity.lua
index 4a21072..10172ad 100644
--- a/cf-lib/data/Entity.lua
+++ b/cf-lib/data/Entity.lua
@@ -26,4 +26,21 @@ Entity.collisionBox = function(width, height, margin)
     }
 end
 
+--- Sets the file name on a picture considering various formats.
+--- If sheets or layers are found, use the optional param to select the right one.
+--- @param sprite table The sprite to replace the filename in
+--- @param filename string The new filename
+--- @param sheetLayer number The sheet or layer index to use. Defaults to 1.
+Entity.setFilename = function(sprite, filename, sheetLayer)
+    if sprite.filename then
+        sprite.filename = filename
+    elseif sprite.sheet then
+        sprite.sheet.filename = filename
+    elseif sprite.sheets then
+        sprite.sheets[sheetLayer or 1].filename = filename
+    elseif sprite.layers then
+        sprite.layers[sheetLayer or 1].filename = filename
+    end
+end
+
 return Entity
\ No newline at end of file
diff --git a/cf-lib/data/Item.lua b/cf-lib/data/Item.lua
index 5934a72..a7d753c 100644
--- a/cf-lib/data/Item.lua
+++ b/cf-lib/data/Item.lua
@@ -32,6 +32,7 @@ end
 --- Applies the item to the game
 function Item:apply()
     data:extend({ self.prototype })
+    return self
 end
 
 --- Assigns data to the item
@@ -50,7 +51,7 @@ function Item:merge(data)
     return self
 end
 
---- Sets the weight of the item calculated from given count per rocket.
+--- Sets the weight of the item calculated from given count per rocket
 --- @param count number The amount of items that fit into a rocket
 function Item:itemsPerRocket(count)
     self.prototype.weight = (1000 / count) * kg
diff --git a/cf-lib/data/Recipe.lua b/cf-lib/data/Recipe.lua
index 213aa14..32a9d67 100644
--- a/cf-lib/data/Recipe.lua
+++ b/cf-lib/data/Recipe.lua
@@ -32,6 +32,7 @@ end
 --- Applies the recipe to the game
 function Recipe:apply()
     data:extend({ self.prototype })
+    return self
 end
 
 --- Assigns data to the recipe
@@ -225,4 +226,26 @@ function Recipe:clone(name)
     return Recipe:new(clone)
 end
 
+--- Adds a small icon in the corner of the regular item
+--- It currently assumes an icon_size of 64
+--- @param icon string The filename of the icon
+--- @param position string The position of the icon. One of ["top-left", "top-right", "bottom-left", "bottom-right"]. Defaults to "bottom-right".
+function Recipe:addIndicatorIcon(icon, position)
+    local icons = self.prototype.icons or {}
+    local mainIcon = icons[1] or self.prototype.icon or nil
+    if not mainIcon then
+        local result = self.prototype.results[1]
+        local resultItem = data.raw[result.type][result.name]
+        icons = resultItem.icons or {{ icon = resultItem.icon }}
+    end
+    local shift = { 8, 8 }
+    if position == "top-left" then shift = { -8, -8 } end
+    if position == "top-right" then shift = { 8, -8 } end
+    if position == "bottom-left" then shift = { -8, 8 } end
+    table.insert(icons, { icon = icon, scale = 0.25, shift = shift })
+    self.prototype.icons = icons
+    log(serpent.block(self.prototype.icons))
+    return self
+end
+
 return Recipe
diff --git a/cf-lib/data/Technology.lua b/cf-lib/data/Technology.lua
index 13a1dd9..3dd3b48 100644
--- a/cf-lib/data/Technology.lua
+++ b/cf-lib/data/Technology.lua
@@ -40,6 +40,7 @@ end
 --- Applies the technology to the game
 function Technology:apply()
     data:extend({ self.prototype })
+    return self
 end
 
 --- Assigns data to the technology
diff --git a/cf-lib/info.json b/cf-lib/info.json
index 51dbeef..77044a6 100644
--- a/cf-lib/info.json
+++ b/cf-lib/info.json
@@ -1,6 +1,6 @@
 {
    "name": "cf-lib",
-   "version": "1.2.0",
+   "version": "1.4.0",
    "title": "cackling fiends library",
    "description": "Because I'd like to have my own library :-)",
    "author": "cackling fiend",