diff --git a/Source/UI/Text/UIAchWnd.h b/Source/UI/Text/UIAchWnd.h
new file mode 100644
index 0000000..788d573
--- /dev/null
+++ b/Source/UI/Text/UIAchWnd.h
@@ -0,0 +1,16 @@
+#ifndef RAGNAROK_SOURCE_UI_TEXT_UIACHWND_H
+#define RAGNAROK_SOURCE_UI_TEXT_UIACHWND_H
+
+#include "UI/Window/UIWindow.h"
+
+class UIAchListWnd : public UIWindow {
+public:
+  void Slot31(int x, int y) override;
+};
+
+class UIAchTab : public UIWindow {
+public:
+  void Slot31(int x, int y) override;
+};
+
+#endif
diff --git a/Source/UI/Text/UITextViewer.cpp b/Source/UI/Text/UITextViewer.cpp
index 4036fa7..130a65c 100644
--- a/Source/UI/Text/UITextViewer.cpp
+++ b/Source/UI/Text/UITextViewer.cpp
@@ -8,6 +8,8 @@
 #include "UI/Lists/UIScrollBar.h"
 #include "UI/Buttons/UITextButton.h"
 #include "UI/Text/UITextViewer.h"
+#include "UI/Text/UIAchWnd.h"
+#include "UI/Window/UIWindowMgr.h"
 
 #include <algorithm>
 
@@ -112,6 +114,18 @@ void UITextViewer::Slot25(int, int) {
 void UITextViewer::Slot26(int, int) {
 }
 
+// OFFSET: 0x007B79F0
+// FUNCTION: fn_09231
+void UIAchListWnd::Slot31(int, int) {
+  g_windowMgr.ReleaseCapture();
+}
+
+// OFFSET: 0x007B7A00
+// FUNCTION: fn_09232
+void UIAchTab::Slot31(int, int) {
+  g_windowMgr.ReleaseCapture();
+}
+
 // OFFSET: 0x007B7A10
 // FUNCTION: fn_09233
 void UITextViewer::Slot31(int, int) {