diff --git a/docs/DeveloperGuide.md b/docs/DeveloperGuide.md
index e89a9409997..e2228e0644e 100644
--- a/docs/DeveloperGuide.md
+++ b/docs/DeveloperGuide.md
@@ -316,7 +316,9 @@ The individual modules are then displayed in `ModuleCard`.
However, as changes in the `UniqueModuleList` will not propagate to the `ObservableList` in `ModulePlanSemesterList`, there is a need for the function `refreshList` to update the `ObservableList` in `ModulePlanSemesterList` whenever changes in the `UniqueModuleList` occurs.
-#### Design Consideration
+
+
+#### Design Considerations
**Aspect: Data Structure to Store `Module`**
@@ -496,6 +498,8 @@ the module if it exists from the database.
6. `AddCommand` then attempts to add the module into the Model via `Model#addModule`.
7. If `ModuleCode`, the user inputs are valid, and the Model does not contain the module, `AddCommand` will
successfully add the new `Module` into the module plan.
+
+
The following two *Sequence Diagrams* shows how the `add` command works:
@@ -723,6 +727,8 @@ Step 3. ModCraft lets the user know if the prerequisites have not been fulfilled
+
+
Step 4. The user now decides to move the module to an earlier semester, and decides to make the appropriate changes by executing the command `edit CS2103T y/1 s/2`. The `edit` command calls `Module#checkPrerequisitesFulfilled(List list)` again to check if the prerequisites have been fulfilled in previous semesters. In this case, they are the Advanced Placement and Year 1 Semester 1 semesters, and the `Module`s in these semesters populate `list`.
Step 5. ModCraft lets the user know if the prerequisites have not been fulfilled, and which prerequisites. Otherwise, it moves the module `CS2103T` to Year 1 Semester 2.