diff --git a/Help/variable/CMAKE_LANG_DEVICE_LINK_MODE.rst b/Help/variable/CMAKE_LANG_DEVICE_LINK_MODE.rst
index 442de8a2db..8ab1de3b03 100644
--- a/Help/variable/CMAKE_LANG_DEVICE_LINK_MODE.rst
+++ b/Help/variable/CMAKE_LANG_DEVICE_LINK_MODE.rst
@@ -10,3 +10,5 @@ Defines how the device link step is done. The possible values are:
 
 ``LINKER``
   The linker is used directly for the device link step.
+
+This variable is read-only. Setting it is undefined behavior.
diff --git a/Help/variable/CMAKE_LANG_LINK_MODE.rst b/Help/variable/CMAKE_LANG_LINK_MODE.rst
index f69818f973..60256714fa 100644
--- a/Help/variable/CMAKE_LANG_LINK_MODE.rst
+++ b/Help/variable/CMAKE_LANG_LINK_MODE.rst
@@ -10,3 +10,5 @@ Defines how the link step is done. The possible values are:
 
 ``LINKER``
   The linker is used directly for the link step.
+
+This variable is read-only. Setting it is undefined behavior.