diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
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 # Risk Dice
 
-An implementation of Risk Dice as found for example in the Splittermond game system.
+An implementation of risk dice as found for example in the Splittermond game
+system.
+
+This module provides a new dice type which represents a risk die. Rolling a risk
+die ist just rolling 4 10 sided dice. The total result is calculated by:
+- If there are either two `1`s or a `1` and a `2` in the results, the total sum
+  is `1 + 1` or `1 + 2` respectively.
+- Otherwise, the total result is the sum of the 2 highest results.
+
+
+```
+/roll dr # Roll a risk die.
+```
+
+![Risk Dice](./risk-dice.png)
+
+
 
 ## Installation
 
diff --git a/risk-dice.png b/risk-dice.png
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Binary files /dev/null and b/risk-dice.png differ
diff --git a/src/module/risk-dice.ts b/src/module/risk-dice.ts
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+++ b/src/module/risk-dice.ts
@@ -0,0 +1,30 @@
+class RiskDie extends DiceTerm {
+    constructor() {
+        super({ number: 4, faces: 10 });
+    }
+
+    get total() {
+        if (!this._evaluated) return null;
+        let total;
+        if (this.values.includes(1) && this.values.includes(2)) {
+            total = 3;
+        } else if (this.values.filter((res) => res === 1).length > 1) {
+            total = 2;
+        } else {
+            total = this.values
+                .sort((a, b) => b - a)
+                .slice(0, 2)
+                .reduce((acc, e) => acc + e, 0);
+        }
+        return total;
+    }
+}
+
+function registerRiskDie() {
+    CONFIG.Dice.types.push(RiskDie);
+    CONFIG.Dice.terms.r = RiskDie;
+}
+
+Hooks.once('init', () => {
+    registerRiskDie();
+});
diff --git a/src/module/risk-die.ts b/src/module/risk-die.ts
deleted file mode 100644
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