diff --git a/docs/sources/panels/query-a-data-source/use-expressions-to-manipulate-data/about-expressions.md b/docs/sources/panels/query-a-data-source/use-expressions-to-manipulate-data/about-expressions.md
index 4e760a47c3f..5b4535fe089 100644
--- a/docs/sources/panels/query-a-data-source/use-expressions-to-manipulate-data/about-expressions.md
+++ b/docs/sources/panels/query-a-data-source/use-expressions-to-manipulate-data/about-expressions.md
@@ -114,7 +114,7 @@ is_nan takes a number or a series and returns `1` for `NaN` values and `0` for o
 
 ##### is_null
 
-is_nan takes a number or a series and returns `1` for `null` values and `0` for other values. For example `is_null($A)`.
+is_null takes a number or a series and returns `1` for `null` values and `0` for other values. For example `is_null($A)`.
 
 ##### is_number