diff --git a/src/item_explanation.md b/src/item_explanation.md
index e3a9ba4..68726e4 100644
--- a/src/item_explanation.md
+++ b/src/item_explanation.md
@@ -4,6 +4,8 @@ All following requests can only read the uploaded data.
 
 To use the build-in link-shortener functionality you have to POST the URL with Content-Type: text/x-uri or Content-Type: text/uri-list.
 
+To change the default expiration date, you can use the `?ttl=` parameter. It supports durations like `60s`, `60m`, `24h`, `30d`, `12M`, `1y` or iso dates like `1970-01-01T00:00:00` in UTC timezone.  
+
 ## Upload a link
 `$ curl -H "Content-Type: text/x-uri" --data "https://example.com" <bin_url>`
 
@@ -14,7 +16,11 @@ To use the build-in link-shortener functionality you have to POST the URL with C
 `$ curl -X POST -H "Content-Type: application/gzip" -T my-file.tar.gz <bin_url>`
 
 ## Pipe into curl
-`$ tar -xcvf - my-files* | curl -X POST -H "Content-Type: application/gzip" -T - <bin_url>`
+`$ tar -cz my-files* | curl -X POST -H "Content-Type: application/gzip" -T - <bin_url>`
+
+## Enryption
+`$ tar -cz my-files | gpg -c | curl -X POST -H "Content-Type: application/octet-stream" -T - <bin_url>`
+`$ curl <bin_url> | gpg -d - | tar -xzf`
 
 ## Accessing the data
 After uploading data you can access it by accessing <bin_url> with an optional file extension that suits the data that you uploaded.