diff --git a/src/2_coordinates.md b/src/2_coordinates.md
index 1c162a295f78141726de0df461a4563a09d51976..c47ab86e3be917125a089deb58fb56e34e477b31 100644
--- a/src/2_coordinates.md
+++ b/src/2_coordinates.md
@@ -347,7 +347,7 @@ $$dV = r^2 \sin\theta dr d\theta d\varphi.$$
 
 We have discussed four different coordinate systems:
 
-1.  tip "*Cartesian coordinates*" 
+1.  !!! tip "Cartesian coordinates" 
     $${\bf r} = (x_1, \ldots, x_n).$$ This systems can be
     used for any dimension $n$. It is particularly convenient for: infinite spaces, systems
     with rectangular symmetry.