diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index ffbce43..fa04ef0 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,7 +4,8 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="18345731-10ed-4927-8692-8685f20e33be" name="Changes" comment="Updated TOC">
+    <list default="true" id="18345731-10ed-4927-8692-8685f20e33be" name="Changes" comment="Added Peer Address section">
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/README.md" beforeDir="false" afterPath="$PROJECT_DIR$/README.md" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
@@ -145,7 +146,7 @@
       <option name="presentableId" value="Default" />
       <updated>1725301232290</updated>
       <workItem from="1725301233351" duration="4877000" />
-      <workItem from="1725312281181" duration="1883000" />
+      <workItem from="1725312281181" duration="2648000" />
     </task>
     <task id="LOCAL-00001" summary="Nothing ever went wrong with plain-old markdown, right?">
       <option name="closed" value="true" />
@@ -243,7 +244,15 @@
       <option name="project" value="LOCAL" />
       <updated>1725318323694</updated>
     </task>
-    <option name="localTasksCounter" value="13" />
+    <task id="LOCAL-00013" summary="Added Peer Address section">
+      <option name="closed" value="true" />
+      <created>1725319221672</created>
+      <option name="number" value="00013" />
+      <option name="presentableId" value="LOCAL-00013" />
+      <option name="project" value="LOCAL" />
+      <updated>1725319221672</updated>
+    </task>
+    <option name="localTasksCounter" value="14" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -274,6 +283,7 @@
     <MESSAGE value="Corrected Error tables as messages itself can be descriptive, but the code remains the same" />
     <MESSAGE value="Updated TOC" />
     <MESSAGE value="Add DNS Handshake section to README" />
-    <option name="LAST_COMMIT_MESSAGE" value="Add DNS Handshake section to README" />
+    <MESSAGE value="Added Peer Address section" />
+    <option name="LAST_COMMIT_MESSAGE" value="Added Peer Address section" />
   </component>
 </project>
\ No newline at end of file
diff --git a/README.md b/README.md
index b21ad2c..ac68e0c 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,10 @@ This project is licensed under GNU Free Documentation License v1.3, see the [LIC
   * [UUID v4](#uuid-v4)
   * [DNS Handshake](#dns-handshake)
   * [Peer Address](#peer-address)
+    * [User Address](#user-address)
+    * [Server Address](#server-address)
+    * [Reserved Usernames](#reserved-usernames)
+    * [Regex Pattern (PCRE)](#regex-pattern-pcre)
   * [RPC Communication](#rpc-communication)
     * [Notification & Request-Response Communication](#notification--request-response-communication)
     * [Request Object](#request-object)
@@ -68,7 +72,6 @@ This project is licensed under GNU Free Documentation License v1.3, see the [LIC
 
 ------------------------------------------------------------------------------------------------------------------------
 
-
 # Specifications
 
 Specifications are used to define exactly how each part of the Socialbox standard works, from communication to privacy,
@@ -129,6 +132,38 @@ This record indicates that the Socialbox instance is hosted on the subdomain soc
 address stays consistent as john@example.com. This is because clients always resolve the main domain to find the TXT
 record, which provides the URL of the Socialbox instance.
 
+  > TODO: Should specify username and domain name restrictions, such as length, character set, etc. (?)
+
+### User Address
+
+A user address is a peer address that identifies a user associated with a Socialbox instance. The user address format
+consists of a username the domain name to which the user's account is registered, for example, *john@example.com*
+
+### Server Address
+
+A server address is a strict peer address that is similar a regular user address but instead the username is always
+`host` and the domain name is the domain name of the server, for example, *host@example.com* indicates that the server
+itself is the peer.
+
+### Reserved Usernames
+
+Certain usernames are reserved and cannot be used by users to register accounts. The following usernames are reserved:
+
+- `host`: Reserved for server addresses.
+- `admin`: Reserved for administrative purposes.
+- `root`: Reserved for the root user.
+- `system`: Reserved for system-related tasks.
+- `anonymous`: Reserved for anonymous users.
+- `guest`: Reserved for guest users.
+- `support`: Reserved for support-related tasks.
+
+### Regex Pattern (PCRE)
+
+The following regex pattern can be used to validate a peer address:
+
+```regex
+^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$
+```
 
 ## RPC Communication
 
@@ -254,6 +289,7 @@ The fields in the error response object are as follows:
 | `error`   | `String`  | Yes      | Method not found | The error message.                                     |
 | `code`    | `Integer` | Yes      | 0                | The error code.                                        |
 
+------------------------------------------------------------------------------------------------------------------------
 
 # Error Codes