diff --git a/docs/UserGuide.md b/docs/UserGuide.md
index 68e44089097..9b521f4d71a 100644
--- a/docs/UserGuide.md
+++ b/docs/UserGuide.md
@@ -661,6 +661,7 @@ Using this function, you can add a task to an internship so that you won't forge
 
 **Format:** `addtask INDEX /task TASK`
 
+- `INDEX` is the internship index you want to add the task to.
 - `TASK` is the task you want to add to the internship.
 
 <div markdown="span" class="alert alert-success">
@@ -694,7 +695,8 @@ Using this function, you can set the deadline to a task under an internship so t
 **Format:** `setdeadline INDEX /selecttask INDEX /deadline DEADLINE`
 
 - The two `INDEX` denote the internship index and task index respectively.
-- `DEADLINE` is the deadline you want to set for the task. It must be in the format `DD/MM/YYYY`, and a valid date.
+- `DEADLINE` is the deadline you want to set for the task. It must be in the format `DD/MM/YYYY`. The day, month and year fields must be valid
+(day must be between 1 and 31 inclusive, month must be between 1 and 12 inclusive, year must be a valid 4 digit number)
 
 <div markdown="span" class="alert alert-success">
 
@@ -816,8 +818,8 @@ Only do so if you are an experienced user! <br>
 
 1. **When using multiple screens**, if you move the application to a secondary screen, and later switch to using only the primary screen, the GUI will open off-screen.<br>
 **The solution** is to delete the `preferences.json` file from the folder where you installed the application. Then, run the application again.
-2. When using the `add` command, the `/phone` parameter allows for more digits that are necessary. <br>
-**The solution** is to manually ensure that the length of the phone numbers you input are correct.
+2. The deadline field accepts potentially invalid dates as long as the day, month and year are individually valid, including past dates.
+
 
 [Go to Table of Contents](#table-of-contents)
 
@@ -838,6 +840,6 @@ Only do so if you are an experienced user! <br>
 | `/role`    | Role for the Internship             | Any text, numbers, or spaces                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
 | `/remark`  | Remark for the Internship           | Any text, numbers, or spaces                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
 | `/task`    | Task for the Internship             | Any text, numbers, or spaces                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
-| `/deadline`| Deadline for the Task               | Valid format: `DD/MM/YYYY`<br>- The date must be a valid date.                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
+| `/deadline`| Deadline for the Task               | Valid format: `DD/MM/YYYY`<br>- The day, month and year fields must be valid.                                                                                                                                                                                                                                                                                                                                                                                                                                    |
 
 [Go to Table of Contents](#table-of-contents)