diff --git a/client/src/components/ui/LongText/index.tsx b/client/src/components/ui/LongText/index.tsx
index 31131f422ac55da5bc891fa68f926e0f2fe5e200..7a725f0fbf73d8d31496c86ad21e6ab0f79c300b 100644
--- a/client/src/components/ui/LongText/index.tsx
+++ b/client/src/components/ui/LongText/index.tsx
@@ -10,6 +10,11 @@ interface Props {
     open?: boolean;
 }
 
+/**
+ * This component displays the given text property as a markdown string. The markdown will be
+ * compiled by the component and then displayed. If the text is long the text will be shown
+ * collapsed and allow the user to expand it and collapse it again.
+ */
 export default function LongText({ text, open }: Props) {
     const [more, setMore] = useState(false);
 
diff --git a/client/src/components/ui/LongText/markdown.ts b/client/src/components/ui/LongText/markdown.ts
index f72628b3b83ec6735cad9ef4002b6facc1f2a07c..e4cba62c35529464bbc5d4cdd301c35241ac19e8 100644
--- a/client/src/components/ui/LongText/markdown.ts
+++ b/client/src/components/ui/LongText/markdown.ts
@@ -1,6 +1,15 @@
 
 type TemplateValue = string | number | TemplateValue[];
 
+/**
+ * This is a simple helper function that will join the elements. This is to be used
+ * as a custom string template literal tag. The custom template tag is mainly used
+ * to get syntax highlighting in code editors.
+ * 
+ * @param str The strings of the template
+ * @param values The values in the template
+ * @returns The concatenated string
+ */
 function html(str: TemplateStringsArray, ...values: TemplateValue[]) {
     return str.map((s, i) => {
         const value = values[i];
@@ -23,6 +32,12 @@ interface Link {
 
 type LinkRegistry = Record<string, Footnote | Link>;
 
+/**
+ * Escape the given string to be displayable directly inside of a HTML document.
+ * 
+ * @param markdown The string to escape
+ * @returns The escaped string
+ */
 function escapeHtml(markdown: string) {
     return markdown
         .replace(/"/g, html`&quot;`)
@@ -32,8 +47,15 @@ function escapeHtml(markdown: string) {
         .replace(/>/g, html`&gt;`);
 }
 
+/**
+ * Compile inline constructs of markdown that can be contained inside of a paragraph.
+ * 
+ * @param markdown The source to compile
+ * @param data The data of all footnotes and named links in the source
+ * @returns The compiled output
+ */
 function compileInlineConstructs(markdown: string, data: LinkRegistry): string {
-    let output = '';
+    let output = ''; 
     let offset = 0;
     let last_copy = 0;
     while (offset < markdown.length) {
@@ -333,13 +355,28 @@ function compileInlineConstructs(markdown: string, data: LinkRegistry): string {
     return output;
 }
 
-function linesToParagraph(lines: string[], paragraphs: string[], data: LinkRegistry) {
-    if (lines.length !== 0 && lines.join(' ').trim().length !== 0) {
+/**
+ * Collect the given lines into a single paragraph, also compiling the inline constructs contained
+ * in the given lines.
+ * 
+ * @param lines The lines to compile
+ * @param paragraphs Where to add the paragraphs to
+ * @param data The data of all footnotes and named links in the source
+ */
+function linesToParagraph(lines: string[], paragraphs: string[], data: LinkRegistry): void {
+    if (lines.length !== 0  && lines.join(' ').trim().length !== 0) {
         paragraphs.push(html`<p class="markdown md-paragraph">${compileInlineConstructs(lines.join(' '), data)}</p>`);
     }
     lines.splice(0);
-}
+} 
 
+/**
+ * Compile all the mark source lines into a string of markdown paragraphs.
+ * 
+ * @param lines The lines to compile
+ * @param data The data of all footnotes and named links in the source
+ * @returns The compiled lines
+ */
 function compileLines(lines: string[], data: LinkRegistry): string[] {
     const lines_to_convert: string[] = [];
     const converted_paragraphs: string[] = [];
@@ -632,6 +669,12 @@ function compileLines(lines: string[], data: LinkRegistry): string[] {
     return converted_paragraphs;
 }
 
+/**
+ * Search for all footnotes and named links in the given lines of markdown code.
+ * 
+ * @param lines The lines to search
+ * @returns The LinkRegistry created from the footnotes
+ */
 function getFootnoteRefs(lines: string[]) {
     const data: LinkRegistry = {};
     let footnote_id = 1;
@@ -656,6 +699,27 @@ function getFootnoteRefs(lines: string[]) {
     return data;
 }
 
+/**
+ * This function will compile the given markdown source to a string containing html.
+ * This compiler supports all basic markdown features and some extended features. The following
+ * features are supported:
+ * - Headings
+ * - Bold, italic and strikethrough
+ * - Blockquotes
+ * - Ordered and unordered lists
+ * - Inline code
+ * - Horizontal rule
+ * - Links
+ * - Images
+ * - Tables
+ * - Fenced code blocks
+ * - Footnotes
+ * - Heading ids
+ * - Task list
+ * 
+ * @param markdown The markdown source
+ * @returns The compilation output
+ */
 export function compileMarkdown(markdown: string): string {
     const lines = markdown.split('\n');
     const data = getFootnoteRefs(lines);
diff --git a/client/src/components/ui/Popup/index.tsx b/client/src/components/ui/Popup/index.tsx
index 54258fb08bb2a57729cfb1e142aa378167c57b62..b597f26ed6f47537d5a4a53ca0674f6a1a318616 100644
--- a/client/src/components/ui/Popup/index.tsx
+++ b/client/src/components/ui/Popup/index.tsx
@@ -10,6 +10,11 @@ interface Props {
     onClose: Function
 }
 
+/**
+ * This is a component that implements a popup. The popup will display the children of the
+ * component. The onClose callbacks will be called when the popup should be closed. The popup when
+ * open will prevent scrolling on the body any grey out the background.
+ */
 export default function Popup({ children, onClose }: Props) {
 
     useEffect(() => {
diff --git a/client/src/components/ui/Project/index.tsx b/client/src/components/ui/Project/index.tsx
index 4f4eec2e8013d94a39553d40dcb5e1f9f2f3e36f..1d197fe51c84ef2d752ed5bb9e53df4a337b2c40 100644
--- a/client/src/components/ui/Project/index.tsx
+++ b/client/src/components/ui/Project/index.tsx
@@ -20,6 +20,10 @@ export interface ProjectProps {
     demo?: boolean;
 }
 
+/**
+ * This is a component that is used in the project grid and shows the information of the given
+ * project. It will also show the deadline, assignees and completion of the project.
+ */
 export default function Project({ project, large, demo }: ProjectProps) {
     const [assignees, setAssignees] = useState<AssignedUser[]>([]);
     const [completion, setCompletion] = useState<Completion>();
diff --git a/client/src/components/ui/ProjectSlide/index.tsx b/client/src/components/ui/ProjectSlide/index.tsx
index a5f7a6bbdee89a989e9e73aa05b359d08e264ceb..d622a91170fae6006a6a9a803d2bd08c9312980f 100644
--- a/client/src/components/ui/ProjectSlide/index.tsx
+++ b/client/src/components/ui/ProjectSlide/index.tsx
@@ -16,6 +16,10 @@ export interface ProjectSlideProps {
     project: Project;
 }
 
+/**
+ * This is a component that is used in the project slider and shows the information of the given
+ * project. It will also show the deadline, assignees and used time for the project.
+ */
 export default function ProjectSlide({ project }: ProjectSlideProps) {
     const [assignees, setAssignees] = useState<AssignedUser[]>([]);
     const [time, setTime] = useState<number>();
diff --git a/client/src/components/ui/Tag/index.tsx b/client/src/components/ui/Tag/index.tsx
index 65ad2e37ef0d4a045e1cdd2af6070390c2f596a3..9cadd9090c48e38f8d5b677658055e3b63b82121 100644
--- a/client/src/components/ui/Tag/index.tsx
+++ b/client/src/components/ui/Tag/index.tsx
@@ -7,6 +7,11 @@ interface Props {
     color?: string;
 }
 
+/**
+ * This is a small component that display the label property using the given color and optionally
+ * using the given icon. The component styles this information in a certain way. This component is
+ * used for the status tags of tasks and projects.
+ */
 export default function Tag({ label, icon, color }: Props) {
     return (
         <span className={'tag ' + (color ? 'bg-gradient-horizontal-' + color : '')}>
diff --git a/client/src/components/ui/Task/index.tsx b/client/src/components/ui/Task/index.tsx
index 0e92f5fed62cff5ce280d3bd6f438fd46ad742aa..afa3021bd412f641ca0d2fbb6e66e5572c465149 100644
--- a/client/src/components/ui/Task/index.tsx
+++ b/client/src/components/ui/Task/index.tsx
@@ -15,6 +15,10 @@ export interface TaskProps {
     subtitle?: string;
 }
 
+/**
+ * This component shows task information given in the task property. It will also show the given
+ * subtitle under the name of the task.
+ */
 export default function TaskComponent({ task, subtitle }: TaskProps) {
     const [assignees, setAssignees] = useState<User[]>([]);