diff --git a/markdown/bitburner.hacknetserversformulas.hashupgradecost.md b/markdown/bitburner.hacknetserversformulas.hashupgradecost.md
index 7431ce569..8c4da240b 100644
--- a/markdown/bitburner.hacknetserversformulas.hashupgradecost.md
+++ b/markdown/bitburner.hacknetserversformulas.hashupgradecost.md
@@ -9,14 +9,14 @@ Calculate hash cost of an upgrade.
 **Signature:**
 
 ```typescript
-hashUpgradeCost(upgName: number, level: number): number;
+hashUpgradeCost(upgName: string, level: number): number;
 ```
 
 ## Parameters
 
 |  Parameter | Type | Description |
 |  --- | --- | --- |
-|  upgName | number | name of the upgrade |
+|  upgName | string | name of the upgrade |
 |  level | number | level of the upgrade |
 
 **Returns:**
diff --git a/src/ScriptEditor/NetscriptDefinitions.d.ts b/src/ScriptEditor/NetscriptDefinitions.d.ts
index 401cca43f..cc83f4c50 100644
--- a/src/ScriptEditor/NetscriptDefinitions.d.ts
+++ b/src/ScriptEditor/NetscriptDefinitions.d.ts
@@ -5231,7 +5231,7 @@ interface HacknetServersFormulas {
    * @param level - level of the upgrade
    * @returns The calculated hash cost.
    */
-  hashUpgradeCost(upgName: number, level: number): number;
+  hashUpgradeCost(upgName: string, level: number): number;
   /**
    * Calculate the cost of a hacknet server.
    * @param n - number of the hacknet server