diff --git a/winsup/cygwin/fhandler_process.cc b/winsup/cygwin/fhandler_process.cc
index 9730fa768..216f095c9 100644
--- a/winsup/cygwin/fhandler_process.cc
+++ b/winsup/cygwin/fhandler_process.cc
@@ -1436,6 +1436,10 @@ get_mem_values (DWORD dwProcessId, unsigned long *vmsize, unsigned long *vmrss,
   PMEMORY_WORKING_SET_LIST p;
   SIZE_T n = 0x4000, length;
 
+  /* This appears to work despite MSDN claiming that QueryWorkingSSet requires
+     PROCESS_QUERY_INFORMATION *and* PROCESS_VM_READ.  Since we're trying to do
+     everything with least perms, we stick to PROCESS_QUERY_INFORMATION only
+     unless this changes in Windows for some reason. */
   hProcess = OpenProcess (PROCESS_QUERY_INFORMATION, FALSE, dwProcessId);
   if (hProcess == NULL)
     {