diff --git a/psutil/_pswindows.py b/psutil/_pswindows.py
index 68580e084..01a9666fa 100644
--- a/psutil/_pswindows.py
+++ b/psutil/_pswindows.py
@@ -755,7 +755,7 @@ def _proc_info(self):
         """
         ret = cext.proc_info(self.pid)
         assert len(ret) == len(pinfo_map)
-        debug("proc_info = %s" % str(ret))
+        debug("\n, pid = %s, proc_info = %s" % (self.pid, str(ret)))
         return ret
 
     def name(self):