diff --git a/lib/Support/Debug.cpp b/lib/Support/Debug.cpp
index 0c0f15eddd3..d9cb8a9da81 100644
--- a/lib/Support/Debug.cpp
+++ b/lib/Support/Debug.cpp
@@ -44,7 +44,7 @@ Debug("debug", cl::desc("Enable debug output"), cl::Hidden,
 //until program termination.
 static cl::opt<unsigned>
 DebugBufferSize("debug-buffer-size",
-                cl::desc("Buffer the last N characters of debug output"
+                cl::desc("Buffer the last N characters of debug output "
                          "until program termination. "
                          "[default 0 -- immediate print-out]"),
                 cl::Hidden,