diff --git a/src/ScriptEditor/NetscriptDefinitions.d.ts b/src/ScriptEditor/NetscriptDefinitions.d.ts
index 5e102ef1b..6cae8d001 100644
--- a/src/ScriptEditor/NetscriptDefinitions.d.ts
+++ b/src/ScriptEditor/NetscriptDefinitions.d.ts
@@ -3797,6 +3797,26 @@ interface SkillsFormulas {
   calculateExp(skill: number, skillMult?: number): number;
 }
 
+/**
+ * Factions formulas
+ * @public
+ */
+ interface FactionsFormulas {
+  /**
+   * Calculate the total required amount of faction reputation to reach a target favor.
+   * @param favor - target faction favor.
+   * @returns The calculated faction reputation required.
+   */
+   calculateFavorToRep(favor: number): number;
+  /**
+   * Calculate the resulting faction favor of a total amount of reputation.
+   * (Faction favor is gained whenever you install an Augmentation.)
+   * @param rep - amount of reputation.
+   * @returns The calculated faction favor.
+   */
+   calculateRepToFavor(rep: number): number;
+}
+
 /**
  * Hacking formulas
  * @public
@@ -4039,6 +4059,8 @@ interface GangFormulas {
  * @public
  */
 export interface Formulas {
+  /** Factions formulas */
+  factions: FactionsFormulas;
   /** Skills formulas */
   skills: SkillsFormulas;
   /** Hacking formulas */