diff --git a/docs-2.0/3.ngql-guide/8.clauses-and-options/return.md b/docs-2.0/3.ngql-guide/8.clauses-and-options/return.md
index 580fd9d202f..adb726af0ba 100644
--- a/docs-2.0/3.ngql-guide/8.clauses-and-options/return.md
+++ b/docs-2.0/3.ngql-guide/8.clauses-and-options/return.md
@@ -341,6 +341,13 @@ nebula> RETURN 1+1;
 | 2     |
 +-------+
 
+nebula> RETURN 1- -1;
++----------+
+| (1--(1)) |
++----------+
+| 2        |
++----------+
+
 nebula> RETURN 3 > 1;
 +-------+
 | (3>1) |
diff --git a/docs-2.0/3.ngql-guide/8.clauses-and-options/yield.md b/docs-2.0/3.ngql-guide/8.clauses-and-options/yield.md
index e463c0ee6a0..cfe7c9b32b8 100644
--- a/docs-2.0/3.ngql-guide/8.clauses-and-options/yield.md
+++ b/docs-2.0/3.ngql-guide/8.clauses-and-options/yield.md
@@ -178,4 +178,11 @@ nebula> YIELD \
 +--------+
 | 1      |
 +--------+
+
+nebula> YIELD 1- -1;
++----------+
+| (1--(1)) |
++----------+
+| 2        |
++----------+
 ```