diff --git a/docs/components/modeler/feel/builtin-functions/feel-built-in-functions-string.md b/docs/components/modeler/feel/builtin-functions/feel-built-in-functions-string.md
index 3d0bbe0fc73..6185481e816 100644
--- a/docs/components/modeler/feel/builtin-functions/feel-built-in-functions-string.md
+++ b/docs/components/modeler/feel/builtin-functions/feel-built-in-functions-string.md
@@ -392,3 +392,28 @@ to base64(value: string): string
 to base64("FEEL")
 // "RkVFTA=="
 ```
+
+## is blank(string)
+
+<MarkerCamundaExtension></MarkerCamundaExtension>
+
+Returns `true` if the given string is blank (empty or contains only whitespaces).
+
+**Function signature**
+
+```feel
+is blank(string: string): boolean
+```
+
+**Examples**
+
+```feel
+is blank("")
+// true
+
+is blank(" ")
+// true
+
+is blank("hello world")
+// false
+```