diff --git a/docs/userDocs/source/user/UsingVectorMode.rst b/docs/userDocs/source/user/UsingVectorMode.rst
index 57a70b250..215ea2120 100644
--- a/docs/userDocs/source/user/UsingVectorMode.rst
+++ b/docs/userDocs/source/user/UsingVectorMode.rst
@@ -1,6 +1,10 @@
 Using Vector Mode for Differentiation
 **************************************
 
+.. note::
+    This feature is still under development and may result in unexpected
+    behavior. Please report any issues you find.
+
 For forward mode AD, the restriction is that the function can be only be
 differentiated with respect to a single input variable. However, in many cases,
 it is desirable to differentiate a function with respect to multiple input