diff --git a/docs/UserGuide.md b/docs/UserGuide.md
index 3599c6d52dd..1b6a868e47c 100644
--- a/docs/UserGuide.md
+++ b/docs/UserGuide.md
@@ -31,6 +31,8 @@ Momentum is a **desktop app** that **helps freelancers track time spent on diffe
    * **`find`**`n/NewMomentum` : Find a project that has `NewMomentum` in its name.
 
    * **`delete`**`3` : Deletes the 3rd project shown in the current list.
+   
+   * **`sort`**`type/deadline order/asc` : Sorts the list of projects by deadline in ascending order.
 
    * **`/exit`** : Exits the app.
 
diff --git a/src/main/java/seedu/momentum/logic/parser/SortCommandParser.java b/src/main/java/seedu/momentum/logic/parser/SortCommandParser.java
index 9f49dd7b8c4..e080bc686b4 100644
--- a/src/main/java/seedu/momentum/logic/parser/SortCommandParser.java
+++ b/src/main/java/seedu/momentum/logic/parser/SortCommandParser.java
@@ -27,6 +27,10 @@ public SortCommand parse(String args) throws ParseException {
         ArgumentMultimap argMultimap =
                 ArgumentTokenizer.tokenize(args, SORT_TYPE, SORT_ORDER);
 
+        if (!argMultimap.getPreamble().isEmpty()) {
+            throw new ParseException(String.format(MESSAGE_INVALID_COMMAND_FORMAT, SortCommand.MESSAGE_USAGE));
+        }
+
         String sortOrder = parseSortOrder(argMultimap);
         boolean isAscending = sortOrder.equals(INPUT_ASCENDING_ORDER);
         SortType sortType = parseSortType(argMultimap);
@@ -41,6 +45,7 @@ public SortCommand parse(String args) throws ParseException {
     }
 
     private String parseSortOrder(ArgumentMultimap argMultimap) throws ParseException {
+
         if (argMultimap.getValue(SORT_ORDER).isEmpty()) {
             return INPUT_ASCENDING_ORDER;
         }
@@ -57,6 +62,7 @@ private String parseSortOrder(ArgumentMultimap argMultimap) throws ParseExceptio
     }
 
     private SortType parseSortType(ArgumentMultimap argMultimap) throws ParseException {
+
         if (argMultimap.getValue(SORT_TYPE).isEmpty()) {
             return SortType.NULL;
         }
@@ -64,10 +70,6 @@ private SortType parseSortType(ArgumentMultimap argMultimap) throws ParseExcepti
         String sortType = argMultimap.getValue(SORT_TYPE).get();
         sortType = sortType.trim();
 
-        if (!argMultimap.getPreamble().isEmpty()) {
-            throw new ParseException(String.format(MESSAGE_INVALID_COMMAND_FORMAT, SortCommand.MESSAGE_USAGE));
-        }
-
         switch (sortType) {
         case INPUT_ALPHA_TYPE:
             return SortType.ALPHA;
diff --git a/src/test/java/seedu/momentum/logic/parser/ProjectBookParserTest.java b/src/test/java/seedu/momentum/logic/parser/ProjectBookParserTest.java
index 0788734f8e6..a9a1321e310 100644
--- a/src/test/java/seedu/momentum/logic/parser/ProjectBookParserTest.java
+++ b/src/test/java/seedu/momentum/logic/parser/ProjectBookParserTest.java
@@ -86,7 +86,6 @@ public void parseCommand_find() throws Exception {
     @Test
     public void parseCommand_sort() throws Exception {
         assertTrue(parser.parseCommand(SortCommand.COMMAND_WORD) instanceof SortCommand);
-        assertTrue(parser.parseCommand(SortCommand.COMMAND_WORD + " 3") instanceof SortCommand);
         SortCommand command = (SortCommand) parser.parseCommand(SortCommand.COMMAND_WORD + " "
                 + SORT_ORDER + SortCommand.INPUT_ASCENDING_ORDER + " " + SORT_TYPE + INPUT_ALPHA_TYPE);
         assertEquals(new SortCommand(SortType.ALPHA, true, false), command);
diff --git a/src/test/java/seedu/momentum/logic/parser/SortCommandParserTest.java b/src/test/java/seedu/momentum/logic/parser/SortCommandParserTest.java
index 273ec446ec6..2f01620dc82 100644
--- a/src/test/java/seedu/momentum/logic/parser/SortCommandParserTest.java
+++ b/src/test/java/seedu/momentum/logic/parser/SortCommandParserTest.java
@@ -80,10 +80,30 @@ public void parse_invalidSortOrder_failure() {
         assertParseFailure(parser, INVALID_SORT_ORDER, MESSAGE_INVALID_SORT_TYPE_OR_ORDER);
     }
 
+    @Test
+    public void parse_nonEmptyPreambleNoArguments_success() {
+
+    }
+
     @Test
     public void parse_nonEmptyPreamble_failure() {
-        String userInput = PREAMBLE_NON_EMPTY + VALID_ALPHA_SORT_TYPE + VALID_ASCENDING_SORT_ORDER;
+
+        // Non-empty preamble without sort type and sort order
+        String userInput = PREAMBLE_NON_EMPTY;
+        assertParseFailure(parser, userInput, MESSAGE_NON_EMPTY_PREAMBLE_FAILURE);
+
+        // Non-empty preamble with valid sort type and sort order
+        userInput = PREAMBLE_NON_EMPTY + VALID_ALPHA_SORT_TYPE + VALID_ASCENDING_SORT_ORDER;
+        assertParseFailure(parser, userInput, MESSAGE_NON_EMPTY_PREAMBLE_FAILURE);
+
+        // Non-empty preamble with valid sort type
+        userInput = PREAMBLE_NON_EMPTY + VALID_ALPHA_SORT_TYPE;
         assertParseFailure(parser, userInput, MESSAGE_NON_EMPTY_PREAMBLE_FAILURE);
+
+        // Non-empty preamble with valid sort order
+        userInput = PREAMBLE_NON_EMPTY + VALID_ASCENDING_SORT_ORDER;
+        assertParseFailure(parser, userInput, MESSAGE_NON_EMPTY_PREAMBLE_FAILURE);
+
     }
 
 }