diff --git a/dist/index.js b/dist/index.js
index 70bb879..a52dd79 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -11954,7 +11954,9 @@ module.exports = {
         value: "pGen",
         name: "Power generation",
         description: "Modifier for power generation",
-        operator: "multiply"
+        operator: "multiply",
+        min: -.35,
+        max: .5
       },
       "2": {
         value: "power",
@@ -11972,7 +11974,9 @@ module.exports = {
         value: "mass",
         name: "Mass",
         description: "Modifier for mass",
-        operator: "multiply"
+        operator: "multiply",
+        min: -1,
+        max: 3.5
       },
       "5": {
         value: "eff",
diff --git a/dist/index.json b/dist/index.json
index 272f271..79f1ffc 100644
--- a/dist/index.json
+++ b/dist/index.json
@@ -14347,7 +14347,9 @@
 				"value": "pGen",
 				"name": "Power generation",
 				"description": "Modifier for power generation",
-				"operator": "multiply"
+				"operator": "multiply",
+				"min": -0.35,
+				"max": 0.5
 			},
 			"2": {
 				"value": "power",
@@ -14365,7 +14367,9 @@
 				"value": "mass",
 				"name": "Mass",
 				"description": "Modifier for mass",
-				"operator": "multiply"
+				"operator": "multiply",
+				"min": -1,
+				"max": 3.5
 			},
 			"5": {
 				"value": "eff",
diff --git a/modifications/modifiers.json b/modifications/modifiers.json
index 8acd866..0fd32d6 100644
--- a/modifications/modifiers.json
+++ b/modifications/modifiers.json
@@ -3,7 +3,9 @@
     "value": "pGen",
     "name": "Power generation",
     "description": "Modifier for power generation",
-    "operator": "multiply"
+    "operator": "multiply",
+    "min": -0.35,
+    "max": 0.50
   },
   "2": {
     "value": "power",
@@ -21,7 +23,9 @@
     "value": "mass",
     "name": "Mass",
     "description": "Modifier for mass",
-    "operator": "multiply"
+    "operator": "multiply",
+    "min": -1,
+    "max": 3.50
   },
   "5": {
     "value": "eff",