diff --git a/PlotLine/Views/Timeline/Index.cshtml b/PlotLine/Views/Timeline/Index.cshtml
index 5214165..5647b5f 100644
--- a/PlotLine/Views/Timeline/Index.cshtml
+++ b/PlotLine/Views/Timeline/Index.cshtml
@@ -151,6 +151,119 @@
         }
         return string.Join(Environment.NewLine, lines);
     }
+    string AssetMarkerLabel(AssetEvent assetEvent)
+    {
+        var typeName = assetEvent.AssetEventTypeName?.Trim() ?? string.Empty;
+        return typeName.ToLowerInvariant() switch
+        {
+            "first mentioned" => "First",
+            "mentioned" => "Ref",
+            "found" => "Find",
+            "lost" => "Lost",
+            "given" => "Give",
+            "taken" => "Take",
+            "stolen" => "Stol",
+            "hidden" => "Hide",
+            "moved" or "location changed" => "Move",
+            "used" => "Use",
+            "opened" => "Open",
+            "destroyed" => "X",
+            "revealed" => "Show",
+            "investigated" => "?",
+            "resolved" => "Done",
+            "state changed" => "State",
+            _ => string.IsNullOrWhiteSpace(typeName) ? "Asset" : typeName.Length <= 5 ? typeName : typeName[..5]
+        };
+    }
+    string AssetMarkerMeaning(AssetEvent assetEvent)
+    {
+        var typeName = assetEvent.AssetEventTypeName?.Trim() ?? string.Empty;
+        return typeName.ToLowerInvariant() switch
+        {
+            "first mentioned" => "Asset is first mentioned in this scene.",
+            "mentioned" => "Asset is mentioned in this scene.",
+            "found" => "Asset is found in this scene.",
+            "lost" => "Asset is lost in this scene.",
+            "given" => "Asset changes hands in this scene.",
+            "taken" => "Asset is taken in this scene.",
+            "stolen" => "Asset is stolen in this scene.",
+            "hidden" => "Asset is hidden in this scene.",
+            "moved" or "location changed" => "Asset changes location in this scene.",
+            "used" => "Asset is used in this scene.",
+            "opened" => "Asset is opened in this scene.",
+            "destroyed" => "Asset is destroyed in this scene.",
+            "revealed" => "Asset is revealed in this scene.",
+            "investigated" => "Asset is investigated in this scene.",
+            "resolved" => "Asset thread is resolved in this scene.",
+            "state changed" => "Asset state changes in this scene.",
+            _ => string.IsNullOrWhiteSpace(typeName) ? "Asset event occurs in this scene." : $"Asset event: {typeName}."
+        };
+    }
+    string AssetMarkerTooltip(AssetEvent assetEvent, Scene scene)
+    {
+        var lines = new List<string>
+        {
+            AssetMarkerMeaning(assetEvent),
+            $"Asset: {assetEvent.AssetName}",
+            $"Event: {assetEvent.EventTitle}",
+            $"Scene: {scene.SceneNumber:g}: {scene.SceneTitle}"
+        };
+        if (!string.IsNullOrWhiteSpace(assetEvent.ToStateName))
+        {
+            lines.Add($"State changes to: {assetEvent.ToStateName}");
+        }
+        if (!string.IsNullOrWhiteSpace(assetEvent.EventDescription))
+        {
+            lines.Add($"Summary: {assetEvent.EventDescription}");
+        }
+        return string.Join(Environment.NewLine, lines);
+    }
+    string CharacterMarkerLabel(SceneCharacter appearance)
+    {
+        var presence = appearance.PresenceTypeName?.Trim() ?? string.Empty;
+        return presence.ToLowerInvariant() switch
+        {
+            "present" => "In",
+            "arrives" => "In+",
+            "leaves" => "Out",
+            "nearby" => "Near",
+            "hidden" => "Hide",
+            "overhearing" => "Hear",
+            "mentioned only" => "Ref",
+            "background" => "Bg",
+            "off-screen" => "Off",
+            _ => "Char"
+        };
+    }
+    string CharacterMarkerMeaning(SceneCharacter appearance)
+    {
+        var presence = appearance.PresenceTypeName?.Trim() ?? string.Empty;
+        return presence.ToLowerInvariant() switch
+        {
+            "present" => "Character appears in this scene.",
+            "arrives" => "Character arrives in this scene.",
+            "leaves" => "Character leaves in this scene.",
+            "nearby" => "Character is nearby in this scene.",
+            "hidden" => "Character is hidden in this scene.",
+            "overhearing" => "Character overhears this scene.",
+            "mentioned only" => "Character is mentioned in this scene.",
+            "background" => "Character is in the background of this scene.",
+            "off-screen" => "Character is off-screen in this scene.",
+            _ => "Character appears in this scene."
+        };
+    }
+    string CharacterMarkerTooltip(SceneCharacter appearance, Scene scene)
+    {
+        var lines = new List<string>
+        {
+            CharacterMarkerMeaning(appearance),
+            $"Character: {appearance.CharacterName}",
+            $"Role: {(string.IsNullOrWhiteSpace(appearance.RoleInSceneTypeName) ? "Not set" : appearance.RoleInSceneTypeName)}",
+            $"Presence: {(string.IsNullOrWhiteSpace(appearance.PresenceTypeName) ? "Not set" : appearance.PresenceTypeName)}",
+            $"Scene: {scene.SceneNumber:g}: {scene.SceneTitle}"
+        };
+        return string.Join(Environment.NewLine, lines);
+    }
     bool HasLeadSceneRole(CharacterLaneViewModel lane) => lane.SceneSlots
         .SelectMany(slot => slot.Appearances)
         .Any(appearance =>
@@ -1056,6 +1169,7 @@ else
                                         <div class="asset-lane-slot" title="Scene @realAssetScene.SceneNumber: @realAssetScene.SceneTitle">
                                             @foreach (var assetEvent in slot?.Events ?? Enumerable.Empty<AssetEvent>())
                                             {
+                                                var assetMarkerTooltip = AssetMarkerTooltip(assetEvent, realAssetScene);
                                                 <a class="asset-marker"
                                                    asp-controller="Timeline"
                                                    asp-action="Index"
@@ -1064,8 +1178,9 @@ else
                                                    asp-route-SelectedSceneID="@realAssetScene.SceneID"
                                                    asp-route-FocusType="asset"
                                                    asp-route-FocusID="@assetEvent.StoryAssetID"
-                                                   title="@assetEvent.AssetName: @assetEvent.EventTitle">
-                                                    @assetEvent.MarkerText
+                                                   title="@assetMarkerTooltip"
+                                                   aria-label="@assetMarkerTooltip">
+                                                    @AssetMarkerLabel(assetEvent)
                                                 </a>
                                             }
                                         </div>
@@ -1129,6 +1244,7 @@ else
                                         <div class="character-lane-slot" title="Scene @realCharacterScene.SceneNumber: @realCharacterScene.SceneTitle">
                                             @foreach (var appearance in slot?.Appearances ?? Enumerable.Empty<SceneCharacter>())
                                             {
+                                                var characterMarkerTooltip = CharacterMarkerTooltip(appearance, realCharacterScene);
                                                 <a class="character-marker"
                                                    asp-controller="Timeline"
                                                    asp-action="Index"
@@ -1137,8 +1253,9 @@ else
                                                    asp-route-SelectedSceneID="@realCharacterScene.SceneID"
                                                    asp-route-FocusType="character"
                                                    asp-route-FocusID="@appearance.CharacterID"
-                                                   title="@appearance.CharacterName: @appearance.RoleInSceneTypeName / @appearance.PresenceTypeName">
-                                                    @(!string.IsNullOrWhiteSpace(appearance.PresenceTypeName) ? appearance.PresenceTypeName.Substring(0, 1) : "C")
+                                                   title="@characterMarkerTooltip"
+                                                   aria-label="@characterMarkerTooltip">
+                                                    @CharacterMarkerLabel(appearance)
                                                 </a>
                                             }
                                         </div>