diff --git a/rhizome_cli.c b/rhizome_cli.c
index 1e9e34f2..7921f22e 100644
--- a/rhizome_cli.c
+++ b/rhizome_cli.c
@@ -222,10 +222,12 @@ static int app_rhizome_add_file(const struct cli_parsed *parsed, struct cli_cont
   }
 
   if (journal && !m->is_journal){
+    // TODO: return a special status code for this case
     ret = WHY("Existing manifest is not a journal");
     goto finish;
   }
   if (!journal && m->is_journal) {
+    // TODO: return a special status code for this case
     ret = WHY("Existing manifest is a journal");
     goto finish;
   }
diff --git a/tests/rhizomeops b/tests/rhizomeops
index 4e00e742..da35d30b 100755
--- a/tests/rhizomeops
+++ b/tests/rhizomeops
@@ -994,7 +994,29 @@ test_JournalAdd() {
    assert diff file filex
 }
 
-doc_AppendFile="Attempting to append to a non-journal fails"
+doc_JournalAddUpdate="Cannot update a journal"
+setup_JournalAddUpdate() {
+   setup_servald
+   setup_rhizome
+   echo "Part One" > file1
+   executeOk_servald rhizome journal append $SIDB1 "" file1
+   assert_stdout_add_file file1
+   extract_stdout_keyvalue BID 'manifestid' '[0-9A-F]\+'
+   executeOk_servald rhizome extract bundle $BID file1x.manifest file1x
+   assert diff file1 file1x
+   extract_manifest_version version file1x.manifest
+   let version=version+1
+   $SED -i -e "/^version=/s/=.*/=$version/" file1x.manifest
+   assert_manifest_fields file1x.manifest version="$version"
+}
+test_JournalAddUpdate() {
+   # TODO: servald should return a status code reserved for this case, instead
+   # of the generic 255 error
+   execute --exit-status=255 $servald rhizome add file $SIDB1 file1x file1x.manifest
+   tfw_cat --stdout --stderr
+}
+
+doc_AppendFile="Cannot append to a non-journal"
 setup_AppendFile() {
    setup_servald
    setup_rhizome