diff --git a/inputs/lecture_1.tex b/inputs/lecture_1.tex
index 3de936a..02f89c6 100644
--- a/inputs/lecture_1.tex
+++ b/inputs/lecture_1.tex
@@ -1,4 +1,4 @@
-% Lecture 1 - 2023-04-04
+\lecture{1}{2023-04-04}{}
 
 First, let us recall some basic definitions:
 \begin{definition}
diff --git a/inputs/lecture_12.tex b/inputs/lecture_12.tex
index d7e0670..7834d56 100644
--- a/inputs/lecture_12.tex
+++ b/inputs/lecture_12.tex
@@ -1,4 +1,4 @@
-% Lecture 12 2023-05-16
+\lecture{12}{2023-05-16}{}
 
 We now want to prove \autoref{clt}.
 The plan is to do the following:
diff --git a/inputs/lecture_13.tex b/inputs/lecture_13.tex
index 4d8c8df..7823b41 100644
--- a/inputs/lecture_13.tex
+++ b/inputs/lecture_13.tex
@@ -1,4 +1,4 @@
-% Lecture 13 2023-05
+\lecture{13}{2023-05}{}
 %The difficult part is to show \autoref{levycontinuity}.
 %This is the last lecture, where we will deal with independent random variables.
 
diff --git a/inputs/lecture_4.tex b/inputs/lecture_4.tex
index 3e3cb9b..7cdc7eb 100644
--- a/inputs/lecture_4.tex
+++ b/inputs/lecture_4.tex
@@ -1 +1,2 @@
+\lecture{4}{}{}
 \todo{Lecture 4 missing}
diff --git a/inputs/lecture_8.tex b/inputs/lecture_8.tex
index 03d7f59..c47f95e 100644
--- a/inputs/lecture_8.tex
+++ b/inputs/lecture_8.tex
@@ -1,4 +1,4 @@
-% Lecture 8 2023-05-02
+\lecture{8}{2023-05-02}{}
 \subsection{Kolmogorov's 0-1-law}
 Some classes of events always have probability $0$ or $1$.
 One example of such a 0-1-law is the Borel-Cantelli Lemma
diff --git a/wtheo.sty b/wtheo.sty
index 1aab83a..56f2b50 100644
--- a/wtheo.sty
+++ b/wtheo.sty
@@ -103,4 +103,4 @@
 \DeclareSimpleMathOperator{Exp}
 
 \newcommand*\dif{\mathop{}\!\mathrm{d}}
-\newcommand\lecture[3]{{\color{gray}\hfill Lecture #1 (#2)}}
+\newcommand\lecture[3]{\hrule{\color{darkgray}\hfill{\tiny[Lecture #1, #2]}}}