diff --git a/src/main/java/app/service/FileOperations.java b/src/main/java/app/service/FileOperations.java
index 64b6200..2e150f7 100644
--- a/src/main/java/app/service/FileOperations.java
+++ b/src/main/java/app/service/FileOperations.java
@@ -20,7 +20,7 @@ public class FileOperations {
    * 
    * @param stage A JavaFX stage is required to show the dialog
    * @return The chosen file
-   * @throws FileNotFoundException
+   * @throws FileNotFoundException if the dialog was canceled
    */
   public static File openFileWithDialog(Stage stage) throws FileNotFoundException {
     File chosenFile = DialogBoxes.showopenFileWithDialog(stage);
@@ -33,11 +33,11 @@ public class FileOperations {
   }
 
   /**
-   * A function to get a file through a dialog
+   * A function to get directory through a dialog
    * 
    * @param stage A JavaFX stage is required to show the dialog
-   * @return The chosen file
-   * @throws FileNotFoundException
+   * @return The chosen directory
+   * @throws FileNotFoundException if the dialog was canceled
    */
   public static File openDirectoryWithDialog(Stage stage) throws FileNotFoundException {
     File dir = DialogBoxes.showOpenDirectoryWithDialog(stage);
@@ -48,6 +48,14 @@ public class FileOperations {
     return dir;
   }
 
+  /**
+   * Saves a file a the specified filepath with the specified content.
+   * Shows an error message to the user if the file was not found at the specified location.
+   * 
+   * @param filepath The path of the file to save the content into
+   * @param content The text content to be saved
+   * @return Whether the file was sucessfully saved
+   */
   public static boolean saveFile(Path filepath, String content) {
     try (PrintWriter writer = new PrintWriter(filepath.toFile())) {
       writer.println(content);
@@ -59,6 +67,14 @@ public class FileOperations {
     }
   }
 
+  /**
+   * Lets the user choose a file to save the specified content into
+   * 
+   * @param stage A JavaFX stage is needed in order to show the file chooser
+   * @param content The content to be saved
+   * 
+   * @return Whether the file was sucessfully saved
+   */
   public static boolean saveFileWithDialog(Stage stage, String content) {
     File chosenLocation;
 
@@ -78,6 +94,14 @@ public class FileOperations {
     return false;
   }
 
+  /**
+   * Tries to read the contents of a file in the specified filepath.
+   * If it fails, it shows the user a corresponding error message.
+   * 
+   * @param filePath The path of the file to be read
+   * 
+   * @return The text content of the file
+   */
   public static String readFile(Path filePath) {
 
     if (filePath == null)
diff --git a/src/main/java/app/service/FiletreeOperations.java b/src/main/java/app/service/FiletreeOperations.java
index 920f638..5be3087 100644
--- a/src/main/java/app/service/FiletreeOperations.java
+++ b/src/main/java/app/service/FiletreeOperations.java
@@ -23,11 +23,11 @@ public class FiletreeOperations {
   private FiletreeOperations() {}
 
   /**
-   * The method to generate the fileTree recursively. If it is a directory a
-   * CheckBoxStringItem is created and the method is called again. It goes through
-   * all until every directory or file inside the orginal CheckBoxItem is made. If
-   * the item is a file it sends it to the help function checkExtension which is
-   * described below.
+   * Generate a filetree recursively, find icons for every file and append them to
+   * the root tree node.
+   * 
+   * @param file The root directory to be at the top of the tree
+   * @param parent The root tree item to append children to
    */
   public static void generateTree(File file, CheckBoxTreeItem<String> parent) {
 
@@ -70,6 +70,10 @@ public class FiletreeOperations {
   /**
    * A helping function to sort the files/directories in the fileTree so that it shows
    * in the correct order.
+   * 
+   * @param dirList The list of directories to append all directories to
+   * @param fileList The list of files to append all the files to
+   * @param file The directory of which children to sort
    */
   private static void sortFiles(List<File> dirList, List<File> fileList, File file) {
     for (File f : file.listFiles()) {
@@ -82,6 +86,14 @@ public class FiletreeOperations {
 
   }
 
+  /**
+   * A function to get an icon for a file based on its mimetype.
+   * If no such icon is found, the function will return a default icon
+   * 
+   * @param file The file to probe for a mimetype
+   * @return An image containing the icon
+   * @throws IOException if the default icon was not found. This should not happen
+   */
   private static Image getIconForFile(File file) throws IOException {
     Image icon;
 
@@ -110,6 +122,13 @@ public class FiletreeOperations {
     return icon;
   }
 
+  /**
+   * Determine the absolute path of a file within the filetree.
+   * @param item The treeitem that represents the file of which path is needed
+   * @return The absolute path of the file that the treeitem represents
+   * @throws FileNotFoundException if no path was found within the filetree such that the
+   *         item could be connected with the root tree item. This should not happen
+   */
   public static Path getPathOfTreeItem(TreeItem<String> item) throws FileNotFoundException {
     Path projectPath = 
       Model
diff --git a/src/main/java/app/settings/SettingsProvider.java b/src/main/java/app/settings/SettingsProvider.java
index 6ed5a87..fc267e4 100644
--- a/src/main/java/app/settings/SettingsProvider.java
+++ b/src/main/java/app/settings/SettingsProvider.java
@@ -15,6 +15,9 @@ import app.events.LanguageChangedEvent;
 import app.events.ThemeChangedEvent;
 import app.model.Model;
 
+/**
+ * A provider for permanent storage of the settings of the application.
+ */
 public class SettingsProvider implements SettingsProviderI {
 
     private EventBus eventBus;
@@ -28,7 +31,7 @@ public class SettingsProvider implements SettingsProviderI {
        Arrays.asList("Java", "Markdown", "Monokai", "Solarized Light");
     
 
-    // Only for testing purposes
+    /** Only for testing purposes */
     protected void setSettingsPath(String settingsPath) {
       this.settingsPath = settingsPath;
     }
@@ -86,11 +89,21 @@ public class SettingsProvider implements SettingsProviderI {
 
     }
 
+    /**
+     * Update the settings whenever the theme gets changed
+     * 
+     * @param event
+     */
     @Subscribe
     private void handle(ThemeChangedEvent event) {
         saveSettings();
     }
 
+    /**
+     * Update the settings whenever the language gets changed
+     * 
+     * @param event
+     */
     @Subscribe
     private void handle(LanguageChangedEvent event) {
         saveSettings();