diff --git a/pollution-module/changelog.txt b/pollution-module/changelog.txt
index bddbea0..3589ae3 100644
--- a/pollution-module/changelog.txt
+++ b/pollution-module/changelog.txt
@@ -1,9 +1,4 @@
 ---------------------------------------------------------------------------------------------------
-Version: 1.0.2
-Date: 10.12.2025
-  Changes:
-    - Use efficiency category instead of adding a new one
----------------------------------------------------------------------------------------------------
 Version: 1.0.1
 Date: 14.11.2025
   Changes:
diff --git a/pollution-module/data.lua b/pollution-module/data.lua
index da9d6cb..358a6b1 100644
--- a/pollution-module/data.lua
+++ b/pollution-module/data.lua
@@ -1,6 +1,10 @@
 local item_sounds = require("__base__.prototypes.item_sounds")
 
 data:extend({
+    {
+        type = "module-category",
+        name = "pollution"
+    },
     {
         type = "module",
         name = "pollution-module",
@@ -8,7 +12,7 @@ data:extend({
         icon = "__pollution-module__/graphics/icons/pollution-module-1.png",
         subgroup = "module",
         color_hint = { text = "E" },
-        category = "efficiency",
+        category = "pollution",
         tier = 1,
         order = "d[pollution]-a[pollution-module-1]",
         inventory_move_sound = item_sounds.module_inventory_move,
@@ -31,7 +35,7 @@ data:extend({
         icon = "__pollution-module__/graphics/icons/pollution-module-2.png",
         subgroup = "module",
         color_hint = { text = "E" },
-        category = "efficiency",
+        category = "pollution",
         tier = 2,
         order = "d[pollution]-b[pollution-module-2]",
         inventory_move_sound = item_sounds.module_inventory_move,
@@ -54,7 +58,7 @@ data:extend({
         icon = "__pollution-module__/graphics/icons/pollution-module-3.png",
         subgroup = "module",
         color_hint = { text = "E" },
-        category = "efficiency",
+        category = "pollution",
         tier = 3,
         order = "d[pollution]-c[pollution-module-3]",
         inventory_move_sound = item_sounds.module_inventory_move,
diff --git a/pollution-module/info.json b/pollution-module/info.json
index e4c5897..e0ecb00 100644
--- a/pollution-module/info.json
+++ b/pollution-module/info.json
@@ -1,6 +1,6 @@
 {
    "name": "pollution-module",
-   "version": "1.0.2",
+   "version": "1.0.1",
    "title": "Pollution module",
    "description": "Adds pollution modules.",
    "author": "cackling fiend",