diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6f7a613..73c5c11 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@
 * Added support for certificates with EdDSA signatures and pubilc keys
 * --add-ca can also now be a directory with \*.pem files
 * Warning of 398 day limit for certificates issued after 2020/9/1
+* Added --user-agent argument to support using a custom User Agent
 
 ### Features implemented / improvements in 3.0
 
diff --git a/doc/testssl.1 b/doc/testssl.1
index c6c3bea..12e51a8 100644
--- a/doc/testssl.1
+++ b/doc/testssl.1
@@ -171,6 +171,8 @@ Please note that \fBfname\fR has to be in Unix format\. DOS carriage returns won
 .
 .P
 \fB\-\-sneaky\fR For HTTP header checks testssl\.sh uses normally the server friendly HTTP user agent \fBTLS tester from ${URL}\fR\. With this option your traces are less verbose and a Firefox user agent is being used\. Be aware that it doesn\'t hide your activities\. That is just not possible (environment preset via \fBSNEAKY=true\fR)\.
+.P
+\fB\-\-user\-agent\fR tells testssl.sh to use the supplied HTTP user agent instead of the standard user agent \fBTLS tester from ${URL}\fR\.
 .
 .P
 \fB\-\-ids\-friendly\fR is a switch which may help to get a scan finished which otherwise would be blocked by a server side IDS\. This switch skips tests for the following vulnerabilities: Heartbleed, CCS Injection, Ticketbleed and ROBOT\. The environment variable OFFENSIVE set to false will achieve the same result\. Please be advised that as an alternative or as a general approach you can try to apply evasion techniques by changing the variables USLEEP_SND and / or USLEEP_REC and maybe MAX_WAITSOCK\.
diff --git a/doc/testssl.1.html b/doc/testssl.1.html
index 0ab379a..9886f46 100644
--- a/doc/testssl.1.html
+++ b/doc/testssl.1.html
@@ -216,6 +216,8 @@ in <code>/etc/hosts</code>.  The use of the switch is only useful if you either
 
 <p><code>--sneaky</code> For HTTP header checks testssl.sh uses normally the server friendly HTTP user agent <code>TLS tester from ${URL}</code>. With this option your traces are less verbose and a Firefox user agent is being used. Be aware that it doesn't hide your activities. That is just not possible (environment preset via <code>SNEAKY=true</code>).</p>
 
+<p><code>--user-agent &lt;user agent></code> tells testssl.sh to use the supplied HTTP user agent instead of the standard user agent <code>TLS tester from ${URL}</code>.</p>
+
 <p><code>--ids-friendly</code> is a switch which may help to get a scan finished which otherwise would be blocked by a server side IDS. This switch skips tests for the following vulnerabilities: Heartbleed, CCS Injection, Ticketbleed and ROBOT. The environment variable OFFENSIVE set to false will achieve the same result. Please be advised that as an alternative or as a general approach you can try to apply evasion techniques by changing the variables USLEEP_SND and / or USLEEP_REC and maybe MAX_WAITSOCK.</p>
 
 <p><code>--phone-out</code> Checking for revoked certificates via CRL and OCSP is not done per default. This switch instructs testssl.sh to query external -- in a sense of the current run -- URIs. By using this switch you acknowledge that the check might have privacy issues, a download of several megabytes (CRL file) may happen and there may be network connectivity problems while contacting the endpoint which testssl.sh doesn't handle. PHONE_OUT is the environment variable for this which needs to be set to true if you want this.</p>
diff --git a/doc/testssl.1.md b/doc/testssl.1.md
index e9012bf..7b68e6f 100644
--- a/doc/testssl.1.md
+++ b/doc/testssl.1.md
@@ -141,6 +141,8 @@ in `/etc/hosts`.  The use of the switch is only useful if you either can't or ar
 
 `--sneaky` For HTTP header checks testssl.sh uses normally the server friendly HTTP user agent `TLS tester from ${URL}`. With this option your traces are less verbose and a Firefox user agent is being used. Be aware that it doesn't hide your activities. That is just not possible (environment preset via `SNEAKY=true`).
 
+`--user-agent <user agent>` tells testssl.sh to use the supplied HTTP user agent instead of the standard user agent `TLS tester from ${URL}`.
+
 `--ids-friendly` is a switch which may help to get a scan finished which otherwise would be blocked by a server side IDS. This switch skips tests for the following vulnerabilities: Heartbleed, CCS Injection, Ticketbleed and ROBOT. The environment variable OFFENSIVE set to false will achieve the same result. Please be advised that as an alternative or as a general approach you can try to apply evasion techniques by changing the variables USLEEP_SND and / or USLEEP_REC and maybe MAX_WAITSOCK.
 
 `--phone-out` Checking for revoked certificates via CRL and OCSP is not done per default. This switch instructs testssl.sh to query external -- in a sense of the current run -- URIs. By using this switch you acknowledge that the check might have privacy issues, a download of several megabytes (CRL file) may happen and there may be network connectivity problems while contacting the endpoint which testssl.sh doesn't handle. PHONE_OUT is the environment variable for this which needs to be set to true if you want this.