Index: llvm/docs/HowToBuildWithPGO.rst
===================================================================
--- llvm/docs/HowToBuildWithPGO.rst
+++ llvm/docs/HowToBuildWithPGO.rst
@@ -13,6 +13,11 @@
 to other subprojects, such as LLD.
 
 
+Using preconfigured CMake caches
+================================
+
+See https://llvm.org/docs/AdvancedBuilds.html#multi-stage-pgo
+
 Using the script
 ================
 
@@ -62,8 +67,8 @@
 Building Clang with PGO
 =======================
 
-If you prefer to not use the script, this briefly goes over how to build
-Clang/LLVM with PGO.
+If you prefer to not use the script or the cmake cache, this briefly goes over
+how to build Clang/LLVM with PGO.
 
 First, you should have at least LLVM, Clang, and compiler-rt checked out
 locally.
Index: llvm/utils/collect_and_build_with_pgo.py
===================================================================
--- llvm/utils/collect_and_build_with_pgo.py
+++ llvm/utils/collect_and_build_with_pgo.py
@@ -10,6 +10,9 @@
 
 This is a total of four clean builds of clang (by default). This may take a
 while. :)
+
+This scripts duplicates https://llvm.org/docs/AdvancedBuilds.html#multi-stage-pgo
+Eventually, it will be updated to instead call the cmake cache mentioned there.
 """
 
 import argparse