diff --git a/dune/gfe/rotation.hh b/dune/gfe/rotation.hh
index ebc0b1d51031908420a5e9a2b6328a1b7a46dfd4..d30bd9e2c3eee111c93401ac2cee9ef4004b38d9 100644
--- a/dune/gfe/rotation.hh
+++ b/dune/gfe/rotation.hh
@@ -244,6 +244,7 @@ public:
 
             for (int m=0; m<3; m++) {
                 
+#warning There is a bug in the following line!
                 result[m][i] = (norm<1e10) 
                     /** \todo Isn't there a better way to implement this stably? */
                     ? 0.5 * (i==m)