diff --git a/README.md b/README.md
index 24b9c2c..8ae2f8c 100644
--- a/README.md
+++ b/README.md
@@ -62,4 +62,5 @@ See the output of `geh --help` for detals.
  * `-`, zoom out current image.
  * `0`, zoom current image to original size.
  * `F11`, toggle fullscreen mode.
+ * `?`, show help window.
 
diff --git a/src/about.c b/src/about.c
index 7142817..353fda7 100644
--- a/src/about.c
+++ b/src/about.c
@@ -168,5 +168,6 @@ gchar * get_key_bindings_message(void)
         "-,   zoom out current image.\n"
         "0,   zoom current image to original size.\n"
         "F11, toggle fullscreen mode.\n"
+        "?,   show this help.\n"
     );
 }
diff --git a/src/ui_window.c b/src/ui_window.c
index f818dac..cd32959 100644
--- a/src/ui_window.c
+++ b/src/ui_window.c
@@ -631,6 +631,12 @@ callback_key_press (GtkWidget *widget, GdkEventKey *key, gpointer data)
         }
         ui->is_fullscreen = ui->is_fullscreen == TRUE ? FALSE : TRUE;
         break;
+    case GDK_KEY_question:
+		gchar * message = get_key_bindings_message ();
+		GtkWidget * about_dialog = create_info_window (GTK_WINDOW (ui->window), "Key Bindings", message);
+		gtk_widget_show (about_dialog);
+		g_free(message);
+        break;
     default:
         return FALSE;
         break;