diff --git a/openmp/docs/SupportAndFAQ.rst b/openmp/docs/SupportAndFAQ.rst
--- a/openmp/docs/SupportAndFAQ.rst
+++ b/openmp/docs/SupportAndFAQ.rst
@@ -329,3 +329,14 @@
 stack memory during execution and crash. The environment variable
 ``LIBOMPTARGET_STACK_SIZE`` can be used to increase the stack size if this
 occurs.
+
+Q: Are libomptarget and plugins backward compatible?
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+No. libomptarget and plugins are now built as LLVM libraries starting from LLVM
+15. Because LLVM libraries are not backward compatible, libomptarget and plugins
+are not as well. Given that fact, the interfaces between 1) the Clang compiler
+and libomptarget, 2) the Clang compiler and device runtime library, and 3) libomptarget
+and plugins are not guaranteed to be compatible. Using the Clang compiler and
+runtime libraries from the same build is always recommended. If not, it is up to
+users to ensure compatibility.