diff --git a/textrender.py b/textrender.py
index 7867de4..1b4df01 100755
--- a/textrender.py
+++ b/textrender.py
@@ -68,18 +68,21 @@ def prepare_render_buffer(r,g,b):
             render_buffer.append(g)
             render_buffer.append(b)
 
-def clear_render_buffeR(r,g,b):
+def clear_render_buffer(r,g,b):
     global render_buffer
     for y in range(DISPLAY_RES_Y):
         for x in range(DISPLAY_RES_X):
-            render_buffer[2+x+y*x]=r
-            render_buffer[3+x+y*x]=g
-            render_buffer[4+x+y*x]=b
+            x3 = x*3
+            res3 = DISPLAY_RES_X*3
+            render_buffer[2+x3+y*res3]=0
+            render_buffer[3+x3+y*res3]=0
+            render_buffer[4+x3+y*res3]=255
 
 
 def render_stub():
     global render_buffer
     prepare_render_buffer(255,0,0)
+    clear_render_buffer(0,0,255)
     sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     sock.sendto(render_buffer, (FLASZKI_UDP_IP, FLASZKI_UDP_PORT))
     time.sleep(3)