[newlib-cygwin] Cygwin: sigproc.cc: add comment

[Ken Brown]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=0416f68de186f3f24b1f8319e0781e6c5ae0ba53

commit 0416f68de186f3f24b1f8319e0781e6c5ae0ba53
Author: Ken Brown <kbrown@cornell.edu>
Date:   Sat Aug 29 05:59:56 2020 -0400

    Cygwin: sigproc.cc: add comment

Diff:
---
 winsup/cygwin/sigproc.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/sigproc.cc b/winsup/cygwin/sigproc.cc
index 2a9734f00..47352c213 100644
--- a/winsup/cygwin/sigproc.cc
+++ b/winsup/cygwin/sigproc.cc
@@ -44,7 +44,11 @@ char NO_COPY myself_nowait_dummy[1] = {'0'};
 
 #define Static static NO_COPY
 
-/* All my children info.  Avoid expensive constructor ops at DLL startup */
+/* All my children info.  Avoid expensive constructor ops at DLL
+   startup.
+
+   This class can allocate memory.  But there's no need to free it
+   because only one instance of the class is created per process. */
 class child_procs {
 #ifdef __i386__
     static const int _NPROCS = 256;