fix geometry tutorial regarding the need to specify the "mode"
diff --git a/doc/C08_TutorialGeometry.dox b/doc/C08_TutorialGeometry.dox
index a824cde..9df19e7 100644
--- a/doc/C08_TutorialGeometry.dox
+++ b/doc/C08_TutorialGeometry.dox
@@ -63,8 +63,8 @@
Translation<float,N>(vecN)\endcode</td></tr>
<tr><td>
N-D \ref TutorialGeoTransform "Affine transformation"</td><td>\code
-Transform<float,N> t = concatenation_of_any_transformations;
-Transform<float,3> t = Translation3f(p) * AngleAxisf(a,axis) * Scaling3f(s);\endcode</td></tr>
+Transform<float,N,Affine> t = concatenation_of_any_transformations;
+Transform<float,3,Affine> t = Translation3f(p) * AngleAxisf(a,axis) * Scaling3f(s);\endcode</td></tr>
<tr><td>
N-D Linear transformations \n
<em class=note>(pure rotations, \n scaling, etc.)</em></td><td>\code