diff --git a/en/application-dev/database/data-persistence-by-preferences.md b/en/application-dev/database/data-persistence-by-preferences.md
index e37c12369d59d2165220c8d8f5bbaa85029c37df..553050a55a585dc34e620623eb187a0365b8488e 100644
--- a/en/application-dev/database/data-persistence-by-preferences.md
+++ b/en/application-dev/database/data-persistence-by-preferences.md
@@ -68,7 +68,7 @@ The following table lists the APIs used for persisting user preference data. For
              return;
            }
            console.info('Succeeded in getting preferences.');
-           // Perform related data operations.
+           // Before performing related data operations, obtain a Preferences instance.
          })
        } catch (err) {
          console.error(`Failed to get preferences. Code:${err.code},message:${err.message}`);
@@ -93,7 +93,7 @@ The following table lists the APIs used for persisting user preference data. For
          return;
        }
        console.info('Succeeded in getting preferences.');
-       // Perform related data operations.
+       // Before performing related data operations, obtain a Preferences instance.
      })
    } catch (err) {
      console.error(`Failed to get preferences. Code is ${err.code},message:${err.message}`);
@@ -220,4 +220,4 @@ The following table lists the APIs used for persisting user preference data. For
    } catch (err) {
      console.error(`Failed to delete preferences. Code:${err.code}, message:${err.message}`);
    }
-   ```
+   ```
\ No newline at end of file
diff --git a/en/application-dev/database/data-sync-of-kv-store.md b/en/application-dev/database/data-sync-of-kv-store.md
index eb8994570f04b0d6690c2b91b1b1745602e980fb..b23dd91ed1a7b4ea0cd13f6d9b49de82e1821190 100644
--- a/en/application-dev/database/data-sync-of-kv-store.md
+++ b/en/application-dev/database/data-sync-of-kv-store.md
@@ -171,7 +171,7 @@ The following uses a single KV store as an example to describe how to implement
          return;
        }
        console.info('Succeeded in getting KVStore.');
-       // Perform related data operations.
+       // Before performing related data operations, obtain a KV store instance.
      });
    } catch (e) {
      console.error(`An unexpected error occurred. Code:${e.code},message:${e.message}`);
@@ -275,4 +275,4 @@ The following uses a single KV store as an example to describe how to implement
        }
      }
    });
-   ```
+   ```
\ No newline at end of file