diff --git a/_toc.yml b/_toc.yml
index a0d4d404..c39a8ab4 100644
--- a/_toc.yml
+++ b/_toc.yml
@@ -92,5 +92,6 @@ parts:
     - file: demos/intro2py
     - file: demos/intro2numpy
     - file: demos/intro2viz
-    - file: demos/animation
     - file: demos/sympy
+
+    
diff --git a/ch01/note02.md b/ch01/note02.md
index 0a9dc3f2..c00cff89 100644
--- a/ch01/note02.md
+++ b/ch01/note02.md
@@ -186,10 +186,9 @@ $$\boxed{E= h\nu}$$
 
 ### The black body radiation distribution function 
 
-:::{Admonition} **Derivation of Black Body radiation formula**
+:::{Admonition} **Deriving Black Body radiation formula**
 :class: tip, dropdown 
 
-### Derivation of Planck's Black Body Radiation Formula
 
 Planck hypothesized that the energy of oscillators in a black body is quantized and given by: