diff --git a/notes/sections/3.md b/notes/sections/3.md
index 14d69f1..f72de81 100644
--- a/notes/sections/3.md
+++ b/notes/sections/3.md
@@ -114,7 +114,7 @@ The sample must now be used to estimate the parameters $\alpha_0$,
 $\beta_0$ and $\gamma_0$ of the angular distribution $F_0$.
 
 
-### Maximum Likelihood method
+### Maximum Likelihood method {#sec:MLM}
 
 The Maximum Likelihood method (MLM) is based on the observation that the best
 estimate {$\bar{\alpha}$, $\bar{\beta}$, $\bar{\gamma}$} of the parameters