diff --git a/src/condition.mjs b/src/condition.mjs
index 4f0ca65..42d742f 100644
--- a/src/condition.mjs
+++ b/src/condition.mjs
@@ -70,6 +70,9 @@ export default class Condition {
       if (this.factResult !== undefined) {
         props.factResult = this.factResult;
       }
+      if (this.valueResult !== undefined) {
+        props.valueResult = this.valueResult
+      }
       if (this.result !== undefined) {
         props.result = this.result;
       }
diff --git a/src/rule.mjs b/src/rule.mjs
index 922b570..38dd530 100644
--- a/src/rule.mjs
+++ b/src/rule.mjs
@@ -229,6 +229,7 @@ class Rule extends EventEmitter {
           .then((evaluationResult) => {
             const passes = evaluationResult.result;
             condition.factResult = evaluationResult.leftHandSideValue;
+            condition.valueResult = evaluationResult.rightHandSideValue;
             condition.result = passes;
             return passes;
           });
diff --git a/test/acceptance/acceptance.test.mjs b/test/acceptance/acceptance.test.mjs
index db70389..68d75fd 100644
--- a/test/acceptance/acceptance.test.mjs
+++ b/test/acceptance/acceptance.test.mjs
@@ -26,6 +26,7 @@ describe("Acceptance", () => {
         path: "$.values",
         value: 2,
         factResult: [2],
+        valueResult: 2,
         result: true,
       },
       {
@@ -33,6 +34,7 @@ describe("Acceptance", () => {
         operator: "in",
         value: [2],
         factResult: 2,
+        valueResult: [2],
         result: true,
       },
     ],
@@ -172,6 +174,7 @@ describe("Acceptance", () => {
             path: "$.values",
             result: true,
             value: 2,
+            valueResult: 2
           },
           {
             fact: "low-priority",
@@ -179,6 +182,9 @@ describe("Acceptance", () => {
             operator: "in",
             result: true,
             value: [2],
+            valueResult: [
+              2
+            ]
           },
         ],
         operator: "all",
@@ -200,6 +206,7 @@ describe("Acceptance", () => {
           {
             fact: "high-priority",
             factResult: [2],
+            valueResult: 2,
             operator: "containsDivisibleValuesOf",
             params: {
               factParam: 1,
diff --git a/test/engine-event.test.mjs b/test/engine-event.test.mjs
index 7cdabbc..ec9f634 100644
--- a/test/engine-event.test.mjs
+++ b/test/engine-event.test.mjs
@@ -687,7 +687,7 @@ describe("Engine: event", () => {
       await engine.run();
       const ruleResult = successSpy.mock.calls[0][2];
       const expected =
-        '{"conditions":{"priority":1,"any":[{"name":"over 21","operator":"greaterThanInclusive","value":21,"fact":"age","factResult":21,"result":true},{"operator":"equal","value":true,"fact":"qualified","factResult":false,"result":false}]},"event":{"type":"setDrinkingFlag","params":{"canOrderDrinks":true}},"priority":100,"result":true}';
+        '{"conditions":{"priority":1,"any":[{"name":"over 21","operator":"greaterThanInclusive","value":21,"fact":"age","factResult":21,"valueResult":21,"result":true},{"operator":"equal","value":true,"fact":"qualified","factResult":false,"valueResult":true,"result":false}]},"event":{"type":"setDrinkingFlag","params":{"canOrderDrinks":true}},"priority":100,"result":true}';
       expect(JSON.stringify(ruleResult)).toBe(expected);
     });
   });
@@ -696,7 +696,7 @@ describe("Engine: event", () => {
     beforeEach(() => setupWithConditionReference())
     it('serializes properties', async () => {
       const { results: [ruleResult] } = await engine.run()
-      const expected = '{"conditions":{"priority":1,"any":[{"priority":1,"all":[{"name":"over 21","operator":"greaterThanInclusive","value":21,"fact":"age","factResult":21,"result":true}]}]},"event":{"type":"awesome"},"priority":100,"result":true}'
+      const expected = '{"conditions":{"priority":1,"any":[{"priority":1,"all":[{"name":"over 21","operator":"greaterThanInclusive","value":21,"fact":"age","factResult":21,"valueResult":21,"result":true}]}]},"event":{"type":"awesome"},"priority":100,"result":true}'
       expect(JSON.stringify(ruleResult)).toEqual(expected)
     })
   })
@@ -707,7 +707,7 @@ describe("Engine: event", () => {
       const { results: [ruleResult] } = await engine.run()
       const { conditions: { any: [conditionReference] } } = ruleResult
       expect(conditionReference.result).toEqual(false)
-      const expected = '{"conditions":{"priority":1,"any":[{"name":"nameOfTheUndefinedConditionReference","condition":"conditionThatIsNotDefined"},{"name":"over 21","operator":"greaterThanInclusive","value":21,"fact":"age","factResult":21,"result":true}]},"event":{"type":"awesome"},"priority":100,"result":true}'
+      const expected = '{"conditions":{"priority":1,"any":[{"name":"nameOfTheUndefinedConditionReference","condition":"conditionThatIsNotDefined"},{"name":"over 21","operator":"greaterThanInclusive","value":21,"fact":"age","factResult":21,"valueResult":21,"result":true}]},"event":{"type":"awesome"},"priority":100,"result":true}'
       expect(JSON.stringify(ruleResult)).toEqual(expected)
     })
   })
diff --git a/test/engine-fact-comparison.test.mjs b/test/engine-fact-comparison.test.mjs
index 585f33c..63e7ea6 100644
--- a/test/engine-fact-comparison.test.mjs
+++ b/test/engine-fact-comparison.test.mjs
@@ -118,4 +118,23 @@ describe("Engine: fact to fact comparison", () => {
       expect(eventSpy).not.toHaveBeenCalled();
     });
   });
+
+  describe('constant facts: checking valueResult and factResult', () => {
+    const constantCondition = {
+      all: [{
+        fact: 'height',
+        operator: 'lessThanInclusive',
+        value: {
+          fact: 'width'
+        }
+      }]
+    }
+    it('result has the correct valueResult and factResult properties', async () => {
+      setup(constantCondition)
+      const result = await engine.run({ height: 1, width: 2 })
+
+      expect(result.results[0].conditions.all[0].factResult).toEqual(1)
+      expect(result.results[0].conditions.all[0].valueResult).toEqual(2)
+    })
+  })
 });
diff --git a/types/index.d.ts b/types/index.d.ts
index 596cedc..db6b873 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -209,6 +209,7 @@ interface BooleanConditionResultProperties {
 
 interface ConditionResultProperties extends BooleanConditionResultProperties {
   factResult?: unknown
+  valueResult?: unknown
 }
 
 interface ConditionProperties {