diff --git a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Axel.java b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Axel.java
index cb10cb8..227fb9f 100644
--- a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Axel.java
+++ b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Axel.java
@@ -46,6 +46,12 @@ public class Axel {
 
 
 	//? User input for a program command or a position
+
+	/**
+	 * Prompts the user to input a command for the program or a position.
+	 * May be called multiple times, if the input is faulty.
+	 * @return The user inputted position or command as a string.
+	 */
 	public static String userCommandPositionInput() {
 		System.out.println();
 		System.out.println("Input a command for the program or a position");
@@ -56,6 +62,14 @@ public class Axel {
 		return userCommandPositionComputation(userCommandPositionInput);
 	}
 
+	/**
+	 * First method in the error check chain for the user input for a command or a position.
+	 * This method may call userCommandPositionInput() again, if the input is faulty.
+	 * Checks if the input is empty and if not decides if the input is a command or a position.
+	 * Calls different methods to check for different errors.
+	 * @param userCommandPositionInput The user inputted position or command as a string.
+	 * @return The user inputted position or command as a string.
+	 */
 	public static String userCommandPositionComputation(String userCommandPositionInput) {
 
 		if (userCommandPositionInput.isEmpty()) {
@@ -86,6 +100,13 @@ public class Axel {
 		return userCommandPositionInput;
 	}
 
+	/**
+	 * Checks if the user inputted command is valid.
+	 * Simply checks if the input equals one of the program commands.
+	 * Case does not matter.
+	 * @param CommandToCheck The user inputted command as a string.
+	 * @return true if the command is valid, false otherwise.
+	 */
 	public static boolean userCommandErrorCheck(String CommandToCheck) {
 		//? true if valid
 		//? valid inputs are: *clear, *exit, *save, *load, *help (and all upper case variants)
@@ -97,6 +118,14 @@ public class Axel {
 		return false;
 	}
 
+	/**
+	 * Checks if the user inputted position is valid.
+	 * Checks if the input is the right length and if it is in the right format.
+	 * Case does not matter.
+	 * @param positionToCheck The user inputted position as a string.
+	 * @param spr The spreadsheet object. (This input is needed for tests)
+	 * @return true if the position is valid, false otherwise.
+	 */
 	public static boolean userPositionErrorCheck(String positionToCheck, Spreadsheet spr) {
 		//? true if valid
 		//? valid inputs are: A1, B14, C79, E99, F1, G99, J1, M98, ... (and all lower case variants)
@@ -122,6 +151,13 @@ public class Axel {
 		return true;
 	}
 
+	/**
+	 * Checks if the user inputted position is in the bounds of the spreadsheet.
+	 * Case does not matter.
+	 * @param positionToCheck The user inputted position as a string.
+	 * @param spr The spreadsheet object. (This input is needed for tests)
+	 * @return true if the position is in the bounds, false otherwise.
+	 */
 	public static boolean userPositionBoundsErrorCheck(String positionToCheck, Spreadsheet spr) {
 		//? true if valid
 
@@ -136,6 +172,13 @@ public class Axel {
 
 
 	//? User input for a value or a formula
+
+	/**
+	 * Prompts the user to input a value or a formula for the selected position.
+	 * May be called multiple times, if the input is faulty.
+	 * @param currentPos The position the user is currently inputting a value or a formula for.
+	 * @return The user inputted value or formula as a string.
+	 */
 	public static String userValueFormulaInput(String currentPos) {
 		System.out.println();
 		System.out.printf("Input a value of a formula for the selected position: %s.%n", currentPos);
@@ -146,6 +189,15 @@ public class Axel {
 		return userValueFormulaComputation(userCommandInput, currentPos);
 	}
 
+	/**
+	 * First method in the error check chain for the user input for a value or a formula.
+	 * This method may call userValueFormulaInput() again, if the input is faulty.
+	 * Checks if the input is empty and if not decides if the input is a value or a formula.
+	 * Calls different methods to check for different errors.
+	 * @param userValueFormulaInput The user inputted value or formula as a string.
+	 * @param currentPos The position the user is currently inputting a value or a formula for.
+	 * @return The user inputted value or formula as a string.
+	 */
 	public static String userValueFormulaComputation(String userValueFormulaInput, String currentPos) {
 		if (userValueFormulaInput.isEmpty()) {
 			System.out.println("Input is empty!");
@@ -170,6 +222,15 @@ public class Axel {
 		return userValueFormulaInput;
 	}
 
+	/**
+	 * Checks if the user inputted formula is a function or expression.
+	 * Removes the '=' at the beginning.
+	 * To decide if a formula is a function, it simply checks if the formula starts with one of the function names.
+	 * Calls different methods to check for different errors.
+	 * Case does not matter.
+	 * @param formulaToCheck The user inputted formula as a string.
+	 * @return true if the formula is valid, false otherwise.
+	 */
 	public static boolean userFormulaErrorCheck(String formulaToCheck) {
 		//? true if valid
 		//? valid inputs are: =7*6, =SUM(A1:A3), =A1, =A1+A2, =A1-A2, ... (and all lower case variants)
@@ -184,6 +245,13 @@ public class Axel {
 		return userFormulaExpressionErrorCheck(formulaToCheck);
 	}
 
+	/**
+	 * Checks a function formula for errors.
+	 * Checks if the formula is in the right format and if the cells in the formula are in the bounds of the spreadsheet.
+	 * Checks for some special cases for different functions.
+	 * @param functionToCheck The user inputted formula as a string.
+	 * @return true if the formula is valid, false otherwise.
+	 */
 	public static boolean userFormulaFunctionErrorCheck(String functionToCheck) {
 		String[] functionCorners = spr.isolateFunctionCorners(functionToCheck);
 
@@ -227,11 +295,23 @@ public class Axel {
 		return true;
 	}
 
+	/**
+	 * Checks an expression formula for errors.
+	 * To be done in the future.
+	 * @param expressionToCheck The user inputted expression formula as a string.
+	 * @return true if the formula is valid, false otherwise.
+	 */
 	public static boolean userFormulaExpressionErrorCheck(String expressionToCheck) {
-		//TODO ME: Maybe not worth the time
+		//TODO ME
 		return true;
 	}
 
+	/**
+	 * Checks if the user inputted value is valid.
+	 * Checks if the input is a positive or negative integer.
+	 * @param valueToCheck The user inputted value as a string.
+	 * @return true if the value is valid, false otherwise.
+	 */
 	public static boolean userValueErrorCheck(String valueToCheck) {
 		//? true if valid
 		//? valid inputs are: 7, 1337, 0, , -213,...
@@ -246,7 +326,12 @@ public class Axel {
 		return true;
 	}
 
-
+	/**
+	 * Executes a program command.
+	 * @param command The user inputted command as a string.
+	 * @return Nothing.
+	 * @throws FileNotFoundException If the file to load or save to is not found.
+	 */
 	public static void executeCommand(String command) throws FileNotFoundException {
 		switch (command) {
 			case "*clear":
@@ -267,6 +352,10 @@ public class Axel {
 		}
 	}
 
+	/**
+	 * Executes the program command to clear the table.
+	 * @return Nothing.
+	 */
 	private static void progClear(){
 		System.out.println("Are you sure you want to clear the table? (yes/no)");
 		System.out.print("Input: ");
@@ -278,17 +367,33 @@ public class Axel {
 		}
 	}
 
+	/**
+	 * Executes the program command to load a table from a csv file.
+	 * @return Nothing.
+	 * @throws FileNotFoundException If the file to load is not found.
+	 */
 	private static void progLoad() throws FileNotFoundException {
 		spr.readCsv(saveFilePath, ",", "Amogus");
 		System.out.println("File loaded!");
 	}
 
+	/**
+	 * Executes the program command to save the table to a csv file.
+	 * @return Nothing.
+	 * @throws FileNotFoundException If the file to save to is not found.
+	 */
 	private static void progSave() throws FileNotFoundException {
 		String savePath = saveFilePath;
 		spr.saveCsv(savePath);
 		System.out.println("File saved");
 	}
 
+	/**
+	 * Executes the program command to exit the program and asks the user to save the table.
+	 * Case does not matter.
+	 * @return Nothing.
+	 * @throws FileNotFoundException If the file to save to is not found.
+	 */
 	private static void progExit() throws FileNotFoundException {
 		System.out.println("Do you want to save befor you exit? (yes/no)");
 		System.out.print("Input: ");