diff --git a/llvm/docs/CMake.rst b/llvm/docs/CMake.rst
--- a/llvm/docs/CMake.rst
+++ b/llvm/docs/CMake.rst
@@ -619,6 +619,12 @@
   If enabled, the Z3 constraint solver is activated for the Clang static analyzer.
   A recent version of the z3 library needs to be available on the system.
 
+**LLVM_USE_SPLIT_DWARF**:BOOL
+  If enabled CMake will pass ``-gsplit-dwarf`` to the compiler. This option
+  reduces link-time meory usage by reducing the amount of debug information that
+  the linker needs to resolve. It is recommended for use on Linux systems when
+  linker memory usage is too high.
+
 CMake Caches
 ============