Update a comment.

llvm-svn: 305601
diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index f5a59f0..8c7a1e7 100644
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -1044,8 +1044,9 @@
 
   Sec->Loc = Buf;
 
-  // We may have already rendered compressed content when using
-  // -compress-debug-sections option. Write it together with header.
+  // If -compress-debug-section is specified and if this is a debug seciton,
+  // we've already compressed section contents. If that's the case,
+  // just write it down.
   if (!Sec->CompressedData.empty()) {
     memcpy(Buf, Sec->ZDebugHeader.data(), Sec->ZDebugHeader.size());
     memcpy(Buf + Sec->ZDebugHeader.size(), Sec->CompressedData.data(),