Index: tools/llc/llc.cpp
===================================================================
--- tools/llc/llc.cpp
+++ tools/llc/llc.cpp
@@ -94,8 +94,8 @@
 
 static cl::opt<std::string> SplitDwarfFile(
     "split-dwarf-file",
-    cl::desc(
-        "Specify the name of the .dwo file to encode in the DWARF output"));
+    cl::desc("Specify the name of the .dwo file to encode in the DWARF output"),
+    cl::value_desc("filename"));
 
 static cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
                               cl::desc("Do not verify input module"));