diff --git a/ftl/core/deck-config.ftl b/ftl/core/deck-config.ftl
index 1e193dc04..3c8e0d0c1 100644
--- a/ftl/core/deck-config.ftl
+++ b/ftl/core/deck-config.ftl
@@ -383,6 +383,7 @@ deck-config-which-deck = Which deck would you like to display options for?
 
 deck-config-updating-cards = Updating cards: { $current_cards_count }/{ $total_cards_count }...
 deck-config-invalid-parameters = The provided FSRS parameters are invalid. Leave them blank to use the default parameters.
+deck-config-manual-parameter-edit-warning = The parameters should only be generated with the optimize button. Manually editing them is heavily advised against.
 deck-config-not-enough-history = Insufficient review history to perform this operation.
 deck-config-must-have-400-reviews =
     { $count ->
diff --git a/ts/routes/deck-options/ParamsInput.svelte b/ts/routes/deck-options/ParamsInput.svelte
index d046c5e84..9917cbf64 100644
--- a/ts/routes/deck-options/ParamsInput.svelte
+++ b/ts/routes/deck-options/ParamsInput.svelte
@@ -46,6 +46,15 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
             input.value = stringValue;
         }
     }
+
+    const UNLOCK_EDIT_COUNT = 3;
+    let rightClickCount = 0;
+    function onRightClick() {
+        rightClickCount += 1;
+        if (rightClickCount == UNLOCK_EDIT_COUNT) {
+            alert(tr.deckConfigManualParameterEditWarning());
+        }
+    }
 </script>
 
 <svelte:window onresize={updateHeight} />
@@ -56,6 +65,8 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
     on:blur={update}
     class="w-100"
     placeholder={render(defaults)}
+    disabled={rightClickCount < UNLOCK_EDIT_COUNT}
+    on:contextmenu={onRightClick}
 ></textarea>
 
 <style>