doc

git-svn-id: svn://tug.org/texlive/trunk@47871 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 9 insertions, 5 deletions

diff --git a/Master/tlpkg/TeXLive/TLUtils.pm b/Master/tlpkg/TeXLive/TLUtils.pm
index 6209b028841..1033d4c106f 100644
--- a/Master/tlpkg/TeXLive/TLUtils.pm
+++ b/Master/tlpkg/TeXLive/TLUtils.pm
@@ -2324,6 +2324,9 @@ gives the TeX Live platform name, used as the extension on our
 executables.  If a program is not present in the TeX Live tree, we also
 check along PATH (without the platform extension.)
 
+Check many different downloads and compressors to determine what is
+working.
+
 Return 0 if failure, nonzero if success.
 
 =cut
@@ -2573,13 +2576,14 @@ Try to download the file given in C<$relpath> from C<$TeXLiveURL>
 into C<$destination>, which can be either
 a filename of simply C<|>. In the latter case a file handle is returned.
 
-Downloading honors two environment variables: C<TL_DOWNLOAD_PROGRAM> and
-C<TL_DOWNLOAD_ARGS>. The former overrides the above specification
-devolving to C<wget>, and the latter overrides the default wget
-arguments.
+Downloading first checks for the environment variable C<TL_DOWNLOADER>,
+which takes various built-in values. If not set, the next check is fr
+C<TL_DOWNLOAD_PROGRAM> and C<TL_DOWNLOAD_ARGS>. The former overrides the
+above specification devolving to C<wget>, and the latter overrides the
+default wget arguments.
 
 C<TL_DOWNLOAD_ARGS> must be defined so that the file the output goes to
-is the first argument after the C<TL_DOWNLOAD_ARGS>.  Thus, typically it
+is the first argument after the C<TL_DOWNLOAD_ARGS>.  Thus, for wget it
 would end in C<-O>.  Use with care.
 
 =cut