diff --git a/slides/chapter-13.en.md b/slides/chapter-13.en.md
index cfcdf8e..8c1e67a 100644
--- a/slides/chapter-13.en.md
+++ b/slides/chapter-13.en.md
@@ -14,7 +14,9 @@ Footnotes <span class="emoji">📎</span>
 \usepackage{hyperref}
 ```
 
-The footnotes are automatically numbered consecutively, independent of sections.
+Footnotes are automatically numbered consecutively, independent of sections.
+
+(Here, the package `hyperref` is used for the `\url` command, it is not necessary for footnotes per se.)
 
 ``` {.hljs .lang-tex}
 The wild boar (Sus scrofa), also known as
@@ -81,6 +83,35 @@ As you can see in figure
 
 @preview
 ![](svg/chapter-13/ref-example-crop.svg)
+@slide(layout=content-only)
+
+@title
+Assigning labels
+
+@content
+Both cross-reference commands work with **sections, figures, tables, listings, and equations,** as long as you use correct labels.
+
+Labels have to be **unambiguous.** For clarity, certain prefixes are common, and some packages use them to derive information.
+
+<table>
+	<tr>
+		<td>`fig:` Figures</td>
+		<td>`tbl:` Tables</td>
+	</tr>
+	<tr>
+		<td>`sec:` Sections</td>
+		<td>`subsec:` Subsections</td>
+	</tr>
+	<tr>
+		<td>`ch:` Chapters</td>
+		<td>`itm:` Enumeration items</td>
+	</tr>
+	<tr>
+		<td>`eq:` Equations</td>
+		<td>`lst:` Source code listings</td>
+	</tr>
+</table>
+
 
 
 @slide(layout=content-and-preview)
@@ -111,31 +142,20 @@ The `\cref` command automatically inserts suitable prefixes.
 @slide(layout=content-only)
 
 @title
-Assigning labels
+Using the `hyperref` package
 
 @content
-Both cross-reference commands work with **sections, figures, tables, listings and equations,** as long as you use correct labels.
+``` {.hljs .lang-tex}
+\usepackage{hyperref}
+```
 
-Labels have to be **unambiguous.** For clarity, certain prefixes are common, and some packages use them to derive information.
+Creates **clickable links** within the document itself (toc, tables/figures, index).
 
-<table>
-	<tr>
-		<td>`fig:` Figures</td>
-		<td>`tbl:` Tables</td>
-	</tr>
-	<tr>
-		<td>`sec:` Sections</td>
-		<td>`subsec:` Subsections</td>
-	</tr>
-	<tr>
-		<td>`ch:` Chapters</td>
-		<td>`itm:` Enumeration items</td>
-	</tr>
-	<tr>
-		<td>`eq:` Equations</td>
-		<td>`lst:` Source code listings</td>
-	</tr>
-</table>
+The appearance of these links is customizable.
+
+The command `\autoref` creates a reference that states the target's type.
+
+The command `\url` creates a monospaced external hyperlink that will open a browser and has special breaking properties.
 
 
 @slide(layout=content-only)
@@ -144,15 +164,15 @@ Labels have to be **unambiguous.** For clarity, certain prefixes are common, and
 Things to consider
 
 @content
-*	++ Passages inserted via `\cref` use the language specified at the document class:
+*	Terms inserted by `\cref` and `\autoref` use the language specified with the document class (or `babel`):
 	
 	``` {.hljs .lang-tex}
 	\documentclass[english]{article}
 	```
 
-*	++ Apart from sections, referenced elements need captions (`\caption{…}`), and the **captions have to be placed before the label.**
+*	Apart from sections, referenced elements need captions (`\caption{…}`), and the **captions have to be placed before the label.**
 
-*	++ For sections, the label is inserted directly after the section command.
+*	For sectioning commands, the label is inserted directly after the section command.
 
 	``` {.hljs .lang-tex}
 	\section{Notes}\label{sec:notes}
@@ -164,8 +184,8 @@ Things to consider
 A few more things
 
 @content
-*	++ If the `hyperref` package is used before `cleveref`, cross-references appear as **clickable links** in the PDF document.
-*	++ `\cref` can take multiple references at once, separated by commas.
+*	It is recommended that you include the package `hyperref` before `cleveref`.
+*	`\cref` can take multiple references at once, separated by commas.
 
 ``` {.hljs .lang-tex}
 \section{An introduction}