diff --git a/common/cogl.c b/common/cogl.c
index 9b1cbf7f0..a4d8feaec 100644
--- a/common/cogl.c
+++ b/common/cogl.c
@@ -500,6 +500,7 @@ cogl_viewport (guint width,
 {
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
 
+  COGL_NOTE (MISC, "glViewport(0, 0, %u, %u)", width, height);
   GE( glViewport (0, 0, width, height) );
 
   ctx->viewport_width = width;