diff --git a/docu/mars-manual.lyx b/docu/mars-manual.lyx
index 6dbc1b13..ea579bf8 100644
--- a/docu/mars-manual.lyx
+++ b/docu/mars-manual.lyx
@@ -7397,6 +7397,52 @@ get-resource-{fat,err,wrn}-count
 \begin_layout Labeling
 \labelwidthstring 00.00.0000
 
+\family typewriter
+replay-code
+\family default
+ Indicate the current state of logfile replay / recovery:
+\end_layout
+
+\begin_deeper
+\begin_layout Labeling
+\labelwidthstring 00.00.0000
+(empty) Unknown.
+\end_layout
+
+\begin_layout Labeling
+\labelwidthstring 00.00.0000
+0 No replay is currently running.
+\end_layout
+
+\begin_layout Labeling
+\labelwidthstring 00.00.0000
+1 Replay is currently running.
+\end_layout
+
+\begin_layout Labeling
+\labelwidthstring 00.00.0000
+2 Replay has successfully stopped.
+\end_layout
+
+\begin_layout Labeling
+\labelwidthstring 00.00.0000
+<0 See Linux 
+\family typewriter
+errno
+\family default
+ code.
+ Typically this indicates a damaged logfile, or another filesystem error
+ at 
+\family typewriter
+/mars
+\family default
+.
+\end_layout
+
+\end_deeper
+\begin_layout Labeling
+\labelwidthstring 00.00.0000
+
 \family typewriter
 is-{attach,sync,fetch,replay,primary,module-loaded}
 \family default
diff --git a/userspace/marsadm b/userspace/marsadm
index 8af3cefd..3aef4b2a 100755
--- a/userspace/marsadm
+++ b/userspace/marsadm
@@ -2999,6 +2999,10 @@ sub eval_fn {
       $lnk = correct_path($lnk);
       return get_link($lnk, 1);
     }
+    if (/^replay[-_]?code$/) {
+      my $lnk = $$env{"resdir"} . "/actual-" . $$env{"host"} . "/replay-code";
+      return get_link($lnk, 2);
+    }
     if (/^(sync|fetch|replay|work)[-_]?(rate|remain)$/) {
       my $what = $1;
       my $select = $2;
@@ -3988,6 +3992,8 @@ my %trivial_globs =
    => "",
    "occupied-size"
    => "",
+   "replay-code"
+   => "When negative, this indidates that a replay/recovery error has occurred.",
    "{sync,fetch,replay,work,syncpos}-{size,pos}"
    => "",
    "{sync,fetch,replay,work}-{rest,{almost-,threshold-,}reached,percent,permille,vector}"