diff --git a/app/imports/api/creature/creatures/Creatures.ts b/app/imports/api/creature/creatures/Creatures.ts
index 35e020a5..e6b170e6 100644
--- a/app/imports/api/creature/creatures/Creatures.ts
+++ b/app/imports/api/creature/creatures/Creatures.ts
@@ -158,6 +158,10 @@ const CreatureSchema = TypedSimpleSchema.from({
     blackbox: true,
     optional: true,
   },
+  lastComputedAt: {
+    type: Date,
+    optional: true,
+  },
 
   // Tabletop
   tabletopId: {
diff --git a/app/imports/api/engine/computation/writeComputation/writeErrorsAndPropCount.js b/app/imports/api/engine/computation/writeComputation/writeErrorsAndPropCount.js
index 383ad2d3..61c3f2d1 100644
--- a/app/imports/api/engine/computation/writeComputation/writeErrorsAndPropCount.js
+++ b/app/imports/api/engine/computation/writeComputation/writeErrorsAndPropCount.js
@@ -2,8 +2,19 @@ import Creatures from '/imports/api/creature/creatures/Creatures';
 
 export default function writeErrorsAndPropCount(creatureId, errors = [], propCount) {
   if (errors.length) {
-    Creatures.update(creatureId, { $set: { computeErrors: errors, propCount } });
+    Creatures.update(creatureId, {
+      $set: {
+        computeErrors: errors,
+        propCount,
+        lastComputedAt: new Date(),
+      }
+    });
   } else {
-    Creatures.update(creatureId, { $set: { propCount }, $unset: { computeErrors: 1 } });
+    Creatures.update(creatureId, {
+      $set: {
+        propCount,
+        lastComputedAt: new Date(),
+      }, $unset: { computeErrors: 1 }
+    });
   }
 }