diff --git a/README.md b/README.md
index a5813d8..02bd9ec 100644
--- a/README.md
+++ b/README.md
@@ -8,19 +8,27 @@ If you find mistakes, please open an issue or fix them yourself and open a PR.
 
 ## Available Summaries & Credits
 ### Semester 1
+<details>
+<summary>Summaries for Semester 1</summary>
 - [Algorithms & Datastructures Summary (EN)](./semester1/algorithms-and-datastructures/ad-janishutz.pdf) Author: Janis Hutz
 - [Linear Algebra Cheat-Sheet (EN)](./semester1/linear-algebra/linAlg-janishutz.pdf) Author: Janis Hutz
 - [Introduction to Programming Short summary (EN)](./semester1/eprog/eprog-janishutz.pdf) Author: Janis Hutz
+</details>
 
 ### Semester 2
+<details>
+<summary>Summaries for Semester 2</summary>
 #### Analysis I
 - [Cheat-Sheet (EN & DE)](./semester2/analysis-i/cheat-sheet-jh/README.md) Author: Janis Hutz
 - [Cheat-Sheet (DE)](./semester2/analysis-i/cheat-sheet-rb/main.pdf) Author: Robin Bacher
 #### Other Courses
 - [Algorithms & Probability Summary (EN)](./semester2/algorithms-and-probability/aw-summary.pdf) Author: Janis Hutz
 - [Parallel Programming Compact Summary (EN)](./semester2/parallel-programming-compact/pprog-compact-summary.pdf) Author: Janis Hutz
+</details>
 
 ### Semester 3
+<details>
+<summary>Summaries for Semester 3</summary>
 #### Theoretical Computer Science
 - [Summary (DE)](./semester3/ti/main/ti-summary.pdf) Author: Janis Hutz
 - [Compact Summary (EN)](./semester3/ti/compact/ti-compact.pdf) Author: Janis Hutz
@@ -31,8 +39,11 @@ If you find mistakes, please open an issue or fix them yourself and open a PR.
 #### Other Courses
 - [Numerical Methods for Computer Science Summary (DE)](./semester3/numcs/numcs-summary.pdf) Authors: Robin Bacher, Janis Hutz
 - [Systems Programming and Computer Architecture Summary (EN)](./semester3/spca/spca-summary.pdf) Authors: Robin Bacher, Janis Hutz
+</details>
 
 ### Semester 4
+<details>
+<summary>Summaries for Semester 4</summary>
 #### Probability & Statistics
 - [Probability & Statistics Cheat-Sheet (DE)](./semester4/ps/ps-jh/probability-and-statistics-cheatsheet.pdf) Author: Janis Hutz
 - [Probability & Statistics Cheat-Sheet (DE)](./semester4/ps/ps-rb/main.pdf) Author: Robin Bacher
@@ -40,16 +51,21 @@ If you find mistakes, please open an issue or fix them yourself and open a PR.
 - [Formal Methods & Functional Programming Summary (EN)](./semester4/fmfp/formal-methods-functional-programming-summary.pdf) Author: Janis Hutz
 - [Data Modelling & Databases Summary (EN)](./semester4/dmdb/data-modelling-databases-summary.pdf) Author: Janis Hutz
 - [Computer Networks (EN)](./semester4/cn/computer-networks-summary.pdf) Author: Not started yet
+</details>
 
 ### Semester 6
+<details>
+<summary>Summaries for Semester 6</summary>
 #### Introduction to Machine Learning
 - [Introduction to Machine Learning Summary (EN)](./semester6/iml/main.pdf) Author: Robin Bacher
+</details>
 
 
 ### Electives
-#### Autonomous Mobile Robots
+<details>
 - [Autonomous Mobile Robots Cheat-Sheet (EN)](./electives/amr/autonomous-mobile-robots-cheatsheet.pdf) Author: Janis Hutz
 - [Virtual Reality I Summary (EN)](./electives/vr1/virtual-reality1-summary.pdf) Author: Janis Hutz
+</details>
 
 
 ## Contributing