diff --git a/docs/csdk-guide.md b/docs/csdk-guide.md
index ef3f252..8467619 100644
--- a/docs/csdk-guide.md
+++ b/docs/csdk-guide.md
@@ -201,8 +201,7 @@
  *
  * @param argc argc argument counter, the number of projection column
  * @param argv argv is a string array of columns that needs to be sorted.
- *                  If it is null or by default all dimensions are selected for sorting
- *                  If it is empty array, no columns are sorted
+ *                  If it is null or empty array, no columns are selected for sorting.
  */
 void sortBy(int argc, char *argv[]);
 ```
diff --git a/docs/sdk-guide.md b/docs/sdk-guide.md
index a912a07..8949fd0 100644
--- a/docs/sdk-guide.md
+++ b/docs/sdk-guide.md
@@ -316,8 +316,7 @@
  * Sets the list of columns that needs to be in sorted order
  *
  * @param sortColumns is a string array of columns that needs to be sorted.
- *                    If it is null or by default all dimensions are selected for sorting
- *                    If it is empty array, no columns are sorted
+ *                    If it is null or empty array, no columns are selected for sorting.
  * @return updated CarbonWriterBuilder
  */
 public CarbonWriterBuilder sortBy(String[] sortColumns);