diff --git a/ftl/core/deck-config.ftl b/ftl/core/deck-config.ftl
index c726cb5d1..15e87d776 100644
--- a/ftl/core/deck-config.ftl
+++ b/ftl/core/deck-config.ftl
@@ -452,6 +452,7 @@ deck-config-percent-of-reviews =
 deck-config-optimizing-preset = Optimizing preset { $current_count }/{ $total_count }...
 deck-config-fsrs-must-be-enabled = FSRS must be enabled first.
 deck-config-fsrs-params-optimal = The FSRS parameters currently appear to be optimal.
+deck-config-fsrs-params-no-reviews = No reviews found. Please check that this preset is assigned to all decks you want to optimize (including subdecks) and try again.
 
 deck-config-wait-for-audio = Wait for audio
 deck-config-show-reminder = Show Reminder
diff --git a/ts/routes/deck-options/FsrsOptions.svelte b/ts/routes/deck-options/FsrsOptions.svelte
index 173ea8d51..921187716 100644
--- a/ts/routes/deck-options/FsrsOptions.svelte
+++ b/ts/routes/deck-options/FsrsOptions.svelte
@@ -148,14 +148,19 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
                         ignoreRevlogsBeforeMs: getIgnoreRevlogsBeforeMs(),
                         currentParams: params,
                     });
-                    if (
+
+                    const already_optimal =
                         (params.length &&
                             params.every(
                                 (n, i) => n.toFixed(4) === resp.params[i].toFixed(4),
                             )) ||
-                        resp.params.length === 0
-                    ) {
-                        setTimeout(() => alert(tr.deckConfigFsrsParamsOptimal()), 200);
+                        resp.params.length === 0;
+
+                    if (already_optimal) {
+                        const msg = resp.fsrsItems
+                            ? tr.deckConfigFsrsParamsOptimal()
+                            : tr.deckConfigFsrsParamsNoReviews();
+                        setTimeout(() => alert(msg), 200);
                     } else {
                         $config.fsrsParams5 = resp.params;
                     }