diff --git a/src/features/online-board/components/OnlineBoardFilter.tsx b/src/features/online-board/components/OnlineBoardFilter.tsx
index 40eb5c0c..14b83c8b 100644
--- a/src/features/online-board/components/OnlineBoardFilter.tsx
+++ b/src/features/online-board/components/OnlineBoardFilter.tsx
@@ -297,6 +297,7 @@ export const OnlineBoardFilter: FC<OnlineBoardFilterProps> = ({
               <a
                 role="button"
                 tabIndex={0}
+                aria-expanded={activeTab === "flight"}
                 onClick={() => handleTabClick("flight")}
                 onKeyDown={(e) => { if (e.key === "Enter" || e.key === " ") handleTabClick("flight"); }}
               >
@@ -399,6 +400,7 @@ export const OnlineBoardFilter: FC<OnlineBoardFilterProps> = ({
               <a
                 role="button"
                 tabIndex={0}
+                aria-expanded={activeTab === "route"}
                 onClick={() => handleTabClick("route")}
                 onKeyDown={(e) => { if (e.key === "Enter" || e.key === " ") handleTabClick("route"); }}
               >
diff --git a/src/ui/layout/SearchHistory.tsx b/src/ui/layout/SearchHistory.tsx
index e0ef1324..ca95cb91 100644
--- a/src/ui/layout/SearchHistory.tsx
+++ b/src/ui/layout/SearchHistory.tsx
@@ -72,6 +72,7 @@ export const SearchHistory: FC = () => {
             <a
               role="button"
               tabIndex={0}
+              aria-expanded={expanded}
               onClick={toggle}
               onKeyDown={(e) => {
                 if (e.key === "Enter" || e.key === " ") {