Update collated files.

collated/main/A0121501E.md

@@ -75,6 +75,9 @@
 ```
 ###### /java/seedu/address/logic/commands/MarkCommand.java
 ``` java
+/**
+ * Marks an entry as completed.
+ */
 public class MarkCommand extends UndoableCommand {
     public static final String COMMAND_WORD = "mark";
 
@@ -146,6 +149,9 @@ public class MarkCommand extends UndoableCommand {
 ```
 ###### /java/seedu/address/logic/commands/RedoCommand.java
 ``` java
+/**
+ * Redo the previous undo command.
+ */
 public class RedoCommand extends Command {
 
     public static final String COMMAND_WORD = "redo";
@@ -176,6 +182,9 @@ public class RedoCommand extends Command {
 ```
 ###### /java/seedu/address/logic/commands/TagCommand.java
 ``` java
+/*
+ * Add tags to an entry. Does not overwrite existing tags.
+ */
 public class TagCommand extends UndoableCommand {
 
     public static final String COMMAND_WORD = "tag";
@@ -258,6 +267,10 @@ public class TagCommand extends UndoableCommand {
 ```
 ###### /java/seedu/address/logic/commands/UndoableCommand.java
 ``` java
+/**
+ * Represents a command which changes to the model can be undone using the undo command
+ * and redone using the redo command
+ */
 public abstract class UndoableCommand extends Command {
 
     public enum CommandState {UNDOABLE, REDOABLE, PRE_EXECUTION};
@@ -267,6 +280,9 @@ public abstract class UndoableCommand extends Command {
     public CommandState commandState = CommandState.PRE_EXECUTION;
     public abstract CommandResult unexecute();
 
+    /**
+     * Re-executes the command which was previously undone.
+     */
     public CommandResult reExecute() {
         if (getCommandState()!=CommandState.REDOABLE){
             return new CommandResult(MESSAGE_UNDO_FAIL);
@@ -289,6 +305,9 @@ public abstract class UndoableCommand extends Command {
 ```
 ###### /java/seedu/address/logic/commands/UndoableCommandHistory.java
 ``` java
+/**
+ * Stack of successfully executed undoable commands.
+ */
 public class UndoableCommandHistory {
     Deque<UndoableCommand> commandInternalUndoQueue = new ArrayDeque<UndoableCommand>();
     Deque<UndoableCommand> commandInternalRedoQueue = new ArrayDeque<UndoableCommand>();
@@ -327,6 +346,9 @@ public class UndoableCommandHistory {
 ```
 ###### /java/seedu/address/logic/commands/UndoCommand.java
 ``` java
+/**
+ * Undo the previous undoable command.
+ */
 public class UndoCommand extends Command {
 
     public static final String COMMAND_WORD = "undo";
@@ -357,11 +379,14 @@ public class UndoCommand extends Command {
 ```
 ###### /java/seedu/address/logic/commands/UnmarkCommand.java
 ``` java
+/**
+ * Unmarks an entry.
+ */
 public class UnmarkCommand extends UndoableCommand {
     public static final String COMMAND_WORD = "unmark";
 
     public static final String MESSAGE_USAGE = COMMAND_WORD
-            + ": Unmarks the entry as completed. "
+            + ": Unmarks the entry. "
             + "Identified by the index number used in the last entry listing.\n"
             + "Parameters: INDEX (must be a positive integer)\n"
             + "Example: " + COMMAND_WORD + " 1";
@@ -428,6 +453,9 @@ public class UnmarkCommand extends UndoableCommand {
 ```
 ###### /java/seedu/address/logic/commands/UntagCommand.java
 ``` java
+/*
+ * Remove tags from an entry.
+ */
 public class UntagCommand extends UndoableCommand {
 
     public static final String COMMAND_WORD = "untag";