fetch_from_archive: Mention that git_fetch_us must be called first

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/dgit b/dgit
index a78e2fbc6d7e3ecc0011b397335dda90fcfc2b44..55a20df84c70415c30389416f4a71404a5193f84 100755 (executable)
--- a/dgit
+++ b/dgit
@@ -1806,7 +1806,7 @@ sub fetch_from_archive () {
     # or another, according to us - ie this client's
     # appropritaely-updated archive view.  Also returns the commit id.
     # If there is nothing in the archive, leaves lrref alone and
-    # returns undef.
+    # returns undef.  git_fetch_us must have already been called.
     get_archive_dsc();
 
     if ($dsc) {