diff --git a/src/modules/graphics.rs b/src/modules/graphics.rs
index 1df1c47..49dad4a 100644
--- a/src/modules/graphics.rs
+++ b/src/modules/graphics.rs
@@ -47,6 +47,23 @@ pub fn display_message<'a>(start: Dot, color: Color, text: &'a CStr, bg_color: O
             start.x << 16 | start.y,
             color.as_rgb_val() | BG_FLAG * bg_color.is_some() as u32 | UTF8_FLAG | ASCIIZ_FLAG,
             text.as_ptr() as u32,
+            0,
+            bg_color.unwrap_or(Color(0, 0, 0)).as_rgb_val(),
+        );
+    }
+}
+
+pub fn display_message_str<'a>(start: Dot, color: Color, text: &'a str, bg_color: Option<Color>) {
+    // XX=ABFFCSSS
+    const UTF8_FLAG: u32 = (3 << 4) << 24; // FF
+    const BG_FLAG: u32 = (1 << 6) << 24; // B
+
+    unsafe {
+        sys::display_message(
+            start.x << 16 | start.y,
+            color.as_rgb_val() | BG_FLAG * bg_color.is_some() as u32 | UTF8_FLAG,
+            text.as_ptr() as u32,
+            text.len() as u32,
             bg_color.unwrap_or(Color(0, 0, 0)).as_rgb_val(),
         );
     }
diff --git a/src/sys.rs b/src/sys.rs
index 2a71f2e..86a3209 100644
--- a/src/sys.rs
+++ b/src/sys.rs
@@ -14,7 +14,7 @@ extern "C" {
 
     // 4
     #[link_name = "_display_message"]
-    pub fn display_message(ebx: u32, ecx: u32, edx: u32, edi: u32);
+    pub fn display_message(ebx: u32, ecx: u32, edx: u32, esi: u32, edi: u32);
 
     // 8
     #[link_name = "_define_button"]
diff --git a/src/syscalls.S b/src/syscalls.S
index 79d4369..2dcb106 100644
--- a/src/syscalls.S
+++ b/src/syscalls.S
@@ -55,7 +55,8 @@ _display_message:
     mov ebx, dword [esp + 4 * 3]
     mov ecx, dword [esp + 4 * 4]
     mov edx, dword [esp + 4 * 5]
-    mov edi, dword [esp + 4 * 6]
+    mov esi, dword [esp + 4 * 6]
+    mov edi, dword [esp + 4 * 7]
     int 0x40
     pop edi esi
     ret