Add a comment to TarWriterTest.LongFilename

diff --git a/llvm/unittests/Support/TarWriterTest.cpp b/llvm/unittests/Support/TarWriterTest.cpp
index 5bbc6615ea5d23331bf0fe7a70c4312fb5d30ee5..579c06d754725142e2b9901a7f91d600824c15c0 100644 (file)
--- a/llvm/unittests/Support/TarWriterTest.cpp
+++ b/llvm/unittests/Support/TarWriterTest.cpp
@@ -81,6 +81,8 @@ TEST_F(TarWriterTest, Basics) {
 }
 
 TEST_F(TarWriterTest, LongFilename) {
+  // The prefix is prefixed by an additional '/' so it's one longer than the
+  // number of x's here.
   std::string x136(136, 'x');
   std::string x137(137, 'x');
   std::string y99(99, 'y');