Added explanatory comment

diff --git a/automake.in b/automake.in
index bf1afcfe91feec250bd6b95c6b6d31774af7a1de..13b9f78761ca2cb0acfd0e34bde7cd9a14a169ef 100755 (executable)
--- a/automake.in
+++ b/automake.in
@@ -6666,6 +6666,8 @@ sub initialize_global_constants
     # Another nastiness: if the file is unreadable by us, we make it
     # readable regardless of the number of links to it.  This only
     # happens in perverse cases.
+    # We use $(install_sh) because that is a known-portable way to
+    # modify the file in place in the source tree.
     $dist_header = '   -find $(distdir) -type d ! -perm -777 -exec chmod a+rwx {} \; -o \\
          ! -type d ! -perm -444 -links 1 -exec chmod a+r {} \; -o \\
          ! -type d ! -perm -400 -exec chmod a+r {} \; -o \\