diff --git a/docs/CMake.rst b/docs/CMake.rst
index 6e385d8cde8..3fd3ee31307 100644
--- a/docs/CMake.rst
+++ b/docs/CMake.rst
@@ -374,6 +374,8 @@ LLVM-specific variables
   i.e. clang needs to be in parallel of llvm instead of nested in `llvm/tools`.
   This feature allows to have one build for only LLVM and another for clang+llvm
   using the same source checkout.
+  The full list is:
+  ``clang;clang-tools-extra;compiler-rt;debuginfo-tests;libc;libclc;libcxx;libcxxabi;libunwind;lld;lldb;llgo;openmp;parallel-libs;polly;pstl``
 
 **LLVM_EXTERNAL_PROJECTS**:STRING
   Semicolon-separated list of additional external projects to build as part of