doc: more subsecond references.

* NEWS: add the original commit reference: 720a11531,
        https://lists.gnu.org/archive/html/automake-commit/2022-02/msg00009.html

diff --git a/NEWS b/NEWS
index dd8e23caef907649ad4c9393d70b2edcc5b9e44e..405c88b92ea5ee784852e92f22d614702fa1aecb 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -58,7 +58,9 @@ New in 1.17:
     support sub-second resolution; otherwise, we fall back to one-second
     granularity as before. When everything is supported, a line
     "Features: subsecond-mtime" is now printed by automake --version and
-    autom4te --version. (bug#64756, bug#67670, bug#68808)
+    autom4te --version. (commit 720a11531,
+      https://lists.gnu.org/archive/html/automake-commit/2022-02/msg00009.html
+    then bug#60808, bug#64756, bug#67670, bug#68808, et al.)
 
   - The default value of $ARFLAGS is now "cr" instead of "cru", to better
     support deterministic builds. (bug#20082)