Update README.md

README.md

@@ -7,8 +7,8 @@ To annotate images:
 * Left-right arrows are used to change between images.
 * Up-down arrows are used to increase or decrease the radius by one (starts with five).
 * Clicking adds annotations (if within the view limits and outside a previously added annotation).
-* Pressing *D* (shift-d) allows deleting one annotation by clicking close (less than five times its radius) to it.
+* Pressing **D** (shift-d) allows deleting one annotation by clicking close (less than five times its radius) to it.
 * Zooming and panning works as normal in Matlab, but must be exited to continue adding annotations.
-* Pressing *s* saves annotations as a `.mat` file and a `.txt` file with csv formatted text. NOTE: previously saved files will be overwritten.
+* Pressing **s** saves annotations as a `.mat` file and a `.txt` file with csv formatted text. NOTE: previously saved files will be overwritten.
 
 Each row of the data contains one annotation given by: image number, transverse (x) coordinate, axial (z) coordinate, radius (in pixels).