diff --git a/README.md b/README.md
index 8b3e968..b831832 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ Hardened, secure, and memory-safe Bash script for summarizing **Postfix** mail l
 * [Usage](#usage)
 * [Options](#options)
 * [Examples](#examples)
+* [Preview](#preview)
 * [Security & Hardening](#security--hardening)
 * [Notes](#notes)
 * [License](#license)
@@ -141,6 +142,31 @@ postfix_summary.sh -d ""
 
 ---
 
+## Preview
+
+**Running `postfix_summary.sh` (default summary view):**
+
+```
+DATE-TIME        ID           CLIENT_IP        SENDER                               RECIPIENT                         STATUS       REASON
+Mar 27 12:34:56  3F2A4B1C0   192.168.1.10     sender@example.com                    recipient@domain.com              sent         [OK]
+Mar 27 12:35:10  4A1B2C3D4   203.0.113.5      admin@domain.org                       user@example.com                  deferred     [Temporary failure]
+```
+
+**Running `postfix_summary.sh -i 3F2A4B1C0` (detail view):**
+
+```
+--- Detail for ID: 3F2A4B1C0 ---
+Date        : Mar 27 12:34:56
+Client IP   : 192.168.1.10
+Sender      : sender@example.com
+Recipient   : recipient@domain.com
+Status      : sent
+Reason      : OK
+--------------------------------
+```
+
+---
+
 ## Security & Hardening
 
 The script applies multiple security measures: