diff --git a/llvm/docs/TestSuiteGuide.md b/llvm/docs/TestSuiteGuide.md
--- a/llvm/docs/TestSuiteGuide.md
+++ b/llvm/docs/TestSuiteGuide.md
@@ -336,8 +336,9 @@
 
 Example:
 ```bash
-# Profile generation run:
+# Profile generation run using LLVM IR PGO:
 % cmake -DTEST_SUITE_PROFILE_GENERATE=ON \
+        -DTEST_SUITE_USE_IR_PGO=ON \
         -DTEST_SUITE_RUN_TYPE=train \
         ../test-suite
 % make
@@ -351,6 +352,8 @@
 % llvm-lit -o result.json .
 ```
 
+To use Clang frontend's PGO instead of LLVM IR PGO, set `-DTEST_SUITE_USE_IR_PGO=OFF`.
+
 The `TEST_SUITE_RUN_TYPE` setting only affects the SPEC benchmark suites.