diff --git a/CHANGELOG.md b/CHANGELOG.md
index de9eec3..8566bc8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # 0.2.1 (2026/01/16)
 * DWMでうまく表示する様に
 * あたしのDWMテーマに合わせる
+* クラス名の修正
 
 # 0.2.0 (2025/07/07)
 * .desktopファイルがなければ、$PATHから実効してみる様に
diff --git a/main.c b/main.c
index a6d768e..da8eed4 100644
--- a/main.c
+++ b/main.c
@@ -17,6 +17,7 @@ Visual *visual;
 
 const char *sofname = "um";
 const char *version = "0.2.1";
+const char *disname = "Unix Menu";
 
 int main() {
   Display *display;
@@ -57,6 +58,20 @@ int main() {
   XChangeProperty(display, window, net_wm_window_type, XA_ATOM, 32,
       PropModeReplace, (unsigned char *)&dialog, 1);
 
+  XStoreName(display, window, disname);
+  Atom net_wm_name = XInternAtom(display, "_NET_WM_NAME", False);
+  XChangeProperty(display, window, net_wm_name,
+      XInternAtom(display, "UTF8_STRING", False), 8,
+      PropModeReplace, (unsigned char *)disname, strlen(disname));
+
+  XClassHint *classHint = XAllocClassHint();
+  if (classHint) {
+    classHint->res_name = "um";
+    classHint->res_class = "UnixMenu";
+    XSetClassHint(display, window, classHint);
+    XFree(classHint);
+  }
+
   XSetWindowBackground(display, window, BGCOL);
 
   XSelectInput(display, window,
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index 9aac1b8..9f8bd2b 100755
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diff --git a/scrot2.png b/scrot2.png
index 3a6b21f..4b7ee1b 100755
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