diff --git a/README.md b/README.md
index 3aecd85..22a5354 100644
--- a/README.md
+++ b/README.md
@@ -11,9 +11,10 @@ swift-project.
 
 Run the tests using:
 
-    sh ./litTest -sv --param package-path=/path/to/downloadable-package .
+    sh ./litTest -sv --param package-path=/path/to/downloadable-package --param llvm-bin-dir=/usr/bin .
 
-where the path is the unarchived package root path.
+where the first path is the unarchived package root path and the second has LLVM
+utilities like `FileCheck`.
 
 Tests
 -----
diff --git a/test-snapshot-binaries/test-rpath-linux.py b/test-snapshot-binaries/test-rpath-linux.py
index aa2450b..f5dc905 100644
--- a/test-snapshot-binaries/test-rpath-linux.py
+++ b/test-snapshot-binaries/test-rpath-linux.py
@@ -42,6 +42,8 @@
 #
 # RUN: find %{package_path} -name "lib*\.so" | xargs %{readelf} -d | %{FileCheck} --check-prefix CHECK-LIB %s
 # CHECK-LIB-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}/home/
+# CHECK-LIB-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}/opt/
 #
 # RUN: find %{package_path}/usr/bin -type f | grep -Ev "\.py|\.txt|\.sh|\.cfg" | xargs %{readelf} -d | %{FileCheck} --check-prefix CHECK-BIN %s
 # CHECK-BIN-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}/home/
+# CHECK-BIN-NOT: {{.*}} {{\(RPATH\)|\(RUNPATH\)}} {{.*}}/opt/