diff --git a/apps/sparo-lib/src/cli/commands/cmd-list.ts b/apps/sparo-lib/src/cli/commands/cmd-list.ts
index 99ee585..8d95350 100644
--- a/apps/sparo-lib/src/cli/commands/cmd-list.ts
+++ b/apps/sparo-lib/src/cli/commands/cmd-list.ts
@@ -11,7 +11,7 @@ import { GitCheckoutCommand } from './git-checkout';
 import { GitFetchCommand } from './git-fetch';
 import { GitPullCommand } from './git-pull';
 import { InitProfileCommand } from './init-profile';
-import { PullCommand } from './pull';
+// import { PullCommand } from './pull';
 
 // When adding new Sparo subcommands, remember to update this doc page:
 // https://github.com/tiktok/sparo/blob/main/apps/website/docs/pages/commands/overview.md
@@ -23,7 +23,8 @@ export const COMMAND_LIST: Constructable[] = [
   CloneCommand,
   CheckoutCommand,
   FetchCommand,
-  PullCommand,
+  // Should be introduced after sparo merge|rebase
+  // PullCommand,
 
   // The commands customized by Sparo require a mirror command to Git
   GitCloneCommand,
diff --git a/apps/sparo-lib/src/services/GitSparseCheckoutService.ts b/apps/sparo-lib/src/services/GitSparseCheckoutService.ts
index afdd211..c449f6b 100644
--- a/apps/sparo-lib/src/services/GitSparseCheckoutService.ts
+++ b/apps/sparo-lib/src/services/GitSparseCheckoutService.ts
@@ -86,6 +86,10 @@ export class GitSparseCheckoutService {
     await this._rushSparseCheckoutAsync({ checkoutAction: 'purge' });
   }
 
+  /**
+   *
+   * @param options
+   */
   private async _rushSparseCheckoutAsync(options: IRushSparseCheckoutOptions): Promise<void> {
     const {
       to,
@@ -179,6 +183,17 @@ export class GitSparseCheckoutService {
 
     {
       const stopwatch: Stopwatch = Stopwatch.start();
+      /**
+       * Perform different logic based on checkoutAction
+       *
+       *   "purge"  : reset repo to skeleton, will remove other paths in checkout paths list
+       *
+       * "skeleton" : checkout skeleton in repo, will only add skeleton paths to checkout paths list
+       *
+       *    "set"   : set checkout paths list by invoking "git sparse-checkout set", will implicitly add skeleton paths to this list.
+       *
+       *    "add"   : add a list of paths to checkout list by invoking "git sparse-checkout add"
+       */
       switch (checkoutAction) {
         case 'purge':
         case 'skeleton':