diff --git a/src/main/java/seedu/address/logic/LogicManager.java b/src/main/java/seedu/address/logic/LogicManager.java
index cb13b38cfd0..a5b3c3e84e7 100644
--- a/src/main/java/seedu/address/logic/LogicManager.java
+++ b/src/main/java/seedu/address/logic/LogicManager.java
@@ -16,6 +16,7 @@
 import seedu.address.logic.commands.Command;
 import seedu.address.logic.commands.CommandGroup;
 import seedu.address.logic.commands.CommandResult;
+import seedu.address.logic.commands.HelpCommand;
 import seedu.address.logic.commands.exceptions.CommandException;
 import seedu.address.logic.parser.DukeDriverParser;
 import seedu.address.logic.parser.exceptions.ParseException;
@@ -74,7 +75,9 @@ public CommandResult execute(String commandText, Predicate<CommandGroup> conditi
         if (condition.test(addressBookParser.parseCommandGroup(commandText))) {
             return execute(addressBookParser.parseCommand(commandText));
         } else {
-            return new CommandResult(String.format(Messages.COMMAND_NOT_ALLOW));
+            return new CommandResult(String.format(Messages.COMMAND_NOT_ALLOW
+                    + "\nPlease refer to User Guide for more details: \n"
+                    + HelpCommand.MESSAGE_USAGE));
         }
     }