[103] Document that index must be a positive integer (#129)

nus-cs2103-AY1617S1 · Sep 29, 2016 · e85c3d7 · e85c3d7
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diff --git a/docs/UserGuide.md b/docs/UserGuide.md
@@ -69,7 +69,8 @@ Deletes the specified person from the address book. Irreversible.<br>
 Format: `delete INDEX`
 
 > Deletes the person at the specified `INDEX`. 
-  The index refers to the index number shown in the most recent listing.
+  The index refers to the index number shown in the most recent listing.<br>
+  The index **must be a positive integer** 1, 2, 3, ...
 
 Examples: 
 * `list`<br>
@@ -84,7 +85,8 @@ Selects the person identified by the index number used in the last person listin
 Format: `select INDEX`
 
 > Selects the person and loads the Google search page the person at the specified `INDEX`. 
-  The index refers to the index number shown in the most recent listing.
+  The index refers to the index number shown in the most recent listing.<br>
+  The index **must be a positive integer** 1, 2, 3, ...
 
 Examples: 
 * `list`<br>

diff --git a/src/main/java/seedu/address/logic/commands/DeleteCommand.java b/src/main/java/seedu/address/logic/commands/DeleteCommand.java
@@ -14,7 +14,7 @@ public class DeleteCommand extends Command {
 
     public static final String MESSAGE_USAGE = COMMAND_WORD
             + ": Deletes the person identified by the index number used in the last person listing.\n"
-            + "Parameters: INDEX\n"
+            + "Parameters: INDEX (must be a positive integer)\n"
             + "Example: " + COMMAND_WORD + " 1";
 
     public static final String MESSAGE_DELETE_PERSON_SUCCESS = "Deleted Person: %1$s";

diff --git a/src/main/java/seedu/address/logic/commands/SelectCommand.java b/src/main/java/seedu/address/logic/commands/SelectCommand.java
@@ -17,7 +17,7 @@ public class SelectCommand extends Command {
 
     public static final String MESSAGE_USAGE = COMMAND_WORD
             + ": Selects the person identified by the index number used in the last person listing.\n"
-            + "Parameters: INDEX\n"
+            + "Parameters: INDEX (must be a positive integer)\n"
             + "Example: " + COMMAND_WORD + " 1";
 
     public static final String MESSAGE_SELECT_PERSON_SUCCESS = "Selected Person: %1$s";