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diff --git a/content/know/concept/sigma-algebra/index.pdc b/content/know/concept/sigma-algebra/index.pdc
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@@ -42,6 +42,9 @@ Likewise, a **sub-$\sigma$-algebra**
 is a sub-family of a certain $\mathcal{F}$,
 which is a valid $\sigma$-algebra in its own right.
 
+
+## Notable examples
+
 A notable $\sigma$-algebra is the **Borel algebra** $\mathcal{B}(\Omega)$,
 which is defined when $\Omega$ is a metric space,
 such as the real numbers $\mathbb{R}$.