diff --git a/pollution-module/data.lua b/pollution-module/data.lua
index f025346..358a6b1 100644
--- a/pollution-module/data.lua
+++ b/pollution-module/data.lua
@@ -83,7 +83,9 @@ data:extend({
             { type = "item", name = "electronic-circuit", amount = 5 }
         },
         energy_required = 15,
-        results = { { type = "item", name = "pollution-module", amount = 1 } }
+        results = { { type = "item", name = "pollution-module", amount = 1 } },
+        category = "crafting",
+        additional_categories = mods["space-age"] and { "electronics" } or nil
     },
     {
         type = "recipe",
@@ -95,7 +97,9 @@ data:extend({
             { type = "item", name = "processing-unit", amount = 5 }
         },
         energy_required = 30,
-        results = { { type = "item", name = "pollution-module-2", amount = 1 } }
+        results = { { type = "item", name = "pollution-module-2", amount = 1 } },
+        category = "crafting",
+        additional_categories = mods["space-age"] and { "electronics" } or nil
     },
     {
         type = "recipe",
@@ -107,7 +111,9 @@ data:extend({
             { type = "item", name = "processing-unit", amount = 5 }
         },
         energy_required = 60,
-        results = { { type = "item", name = "pollution-module-3", amount = 1 } }
+        results = { { type = "item", name = "pollution-module-3", amount = 1 } },
+        category = "crafting",
+        additional_categories = mods["space-age"] and { "electronics" } or nil
     },
     {
         type = "technology",