diff --git a/src/system/version_migration/version_converter.ts b/src/system/version_migration/version_converter.ts
index 0fcfa9f9fdc..10505fbf626 100644
--- a/src/system/version_migration/version_converter.ts
+++ b/src/system/version_migration/version_converter.ts
@@ -14,12 +14,27 @@ export abstract class VersionConverter {
     }
   }
 
+  /**
+   * Iterates through an array of designated migration functions that are each
+   * called one by one to transform the data.
+   * @param data The data to be operated on
+   * @param migrationArr An array of functions that will transform the incoming data
+   */
   callMigrators(data: any, migrationArr: readonly any[]) {
     for (const migrate of migrationArr) {
       migrate(data);
     }
   }
 
+  /**
+   * Uses the current version the incoming data to determine the starting point
+   * of the migration which will cascade up to the latest version, calling the
+   * necessary migration functions in the process.
+   * @param data The data to be operated on
+   * @param curVersion [0] Current major version
+   *                   [1] Current minor version
+   *                   [2] Current patch version
+   */
   abstract applyMigration(data: any, curVersion: number[]): void;
 }
 
@@ -28,7 +43,7 @@ export class SessionVersionConverter extends VersionConverter {
     super(data, gameVersion);
   }
 
-  applyMigration(data: SessionSaveData, curVersion: number[]): void {
+  override applyMigration(data: SessionSaveData, curVersion: number[]): void {
     const [ curMajor, curMinor, curPatch ] = curVersion;
 
     switch (curMajor) {
@@ -52,7 +67,7 @@ export class SystemVersionConverter extends VersionConverter {
     super(data, gameVersion);
   }
 
-  applyMigration(data: SystemSaveData, curVersion: number[]): void {
+  override applyMigration(data: SystemSaveData, curVersion: number[]): void {
     const [ curMajor, curMinor, curPatch ] = curVersion;
 
     switch (curMajor) {
@@ -77,7 +92,7 @@ export class SettingsVersionConverter extends VersionConverter {
     super(data, gameVersion);
   }
 
-  applyMigration(data: Object, curVersion: number[]): void {
+  override applyMigration(data: Object, curVersion: number[]): void {
     const [ curMajor, curMinor, curPatch ] = curVersion;
 
     switch (curMajor) {
diff --git a/src/system/version_migration/versions/v1_0_4.ts b/src/system/version_migration/versions/v1_0_4.ts
index 4131ee4236d..c20e2a281e7 100644
--- a/src/system/version_migration/versions/v1_0_4.ts
+++ b/src/system/version_migration/versions/v1_0_4.ts
@@ -2,15 +2,13 @@ import { SettingKeys } from "../../settings/settings";
 import { AbilityAttr, defaultStarterSpecies, DexAttr, SystemSaveData, SessionSaveData  } from "../../game-data";
 import { allSpecies } from "../../../data/pokemon-species";
 
-
 export const systemMigrators = [
   /**
-   * Migrate ability starter data if empty for caught species
+   * Migrate ability starter data if empty for caught species.
    * @param data {@linkcode SystemSaveData}
    */
   function migrateAbilityData(data: SystemSaveData) {
     if (data.starterData && data.dexData) {
-      // Migrate ability starter data if empty for caught species
       Object.keys(data.starterData).forEach(sd => {
         if (data.dexData[sd]?.caughtAttr && (data.starterData[sd] && !data.starterData[sd].abilityAttr)) {
           data.starterData[sd].abilityAttr = 1;
@@ -20,7 +18,7 @@ export const systemMigrators = [
   },
 
   /**
-   * Populate legendary Pokémon statistics if they are missing
+   * Populate legendary Pokémon statistics if they are missing.
    * @param data {@linkcode SystemSaveData}
    */
   function fixLegendaryStats(data: SystemSaveData) {
@@ -44,7 +42,7 @@ export const systemMigrators = [
   },
 
   /**
-   * Unlock all starters' first ability and female gender option
+   * Unlock all starters' first ability and female gender option.
    * @param data {@linkcode SystemSaveData}
    */
   function fixStarterData(data: SystemSaveData) {