diff --git a/ReleaseNotes.md b/ReleaseNotes.md
index 74f0e8e6964df85546d80ac972553cc47e60c349..ba7fe9e64c66404d841d6de32db67c9c40fb4fc4 100644
--- a/ReleaseNotes.md
+++ b/ReleaseNotes.md
@@ -6,6 +6,7 @@
 - cta/CTA#214 - Update manual page for cta-admin to include info about user defined config files.
 ### Bug fixes
 - cta/CTA#93 - Refactor Frontend code to allow code sharing between SSI and gRPC implementations
+- cta/CTA#221 - Change option in cta-send-event from instance to eos.instance
 
 # v4.7.14-1
 
diff --git a/cmdline/standalone_cli_tools/CtaSendEvent.cpp b/cmdline/standalone_cli_tools/CtaSendEvent.cpp
index 987d7c170aa7da036e519b57a3044c985c5012f5..c72fc6d981c07780a05329c6c7f5ccd10661062e 100644
--- a/cmdline/standalone_cli_tools/CtaSendEvent.cpp
+++ b/cmdline/standalone_cli_tools/CtaSendEvent.cpp
@@ -26,6 +26,7 @@
 #include "CtaFrontendApi.hpp"
 #include "version.h"
 #include "common/CmdLineArgs.hpp"
+#include "common/exception/CommandLineNotParsed.hpp"
 
 const std::string config_file = "/etc/cta/cta-cli.conf";
 
@@ -111,9 +112,7 @@ void parseFileInfo(std::istream &in, AttrMap &attr, AttrMap &xattr)
 void fillNotification(cta::eos::Notification &notification, const std::string &wf_command,
                       const int argc, char *const *const argv)
 {
-
   cta::cliTool::CmdLineArgs cmdLineArgs(argc, argv, cta::cliTool::StandaloneCliTool::CTA_SEND_EVENT);
-
   const std::string &eos_instance = cmdLineArgs.m_diskInstance.value();
   const std::string &eos_endpoint = cmdLineArgs.m_eosEndpoint.has_value() ? cmdLineArgs.m_eosEndpoint.value() : "localhost:1095";
   const std::string &requester_user = cmdLineArgs.m_requestUser.value();
@@ -135,10 +134,10 @@ void fillNotification(cta::eos::Notification &notification, const std::string &w
 
   std::string accessUrl = "root://" + eos_endpoint + "/" + attr["path"] + "?eos.lfn=fxid:" + attr["fxid"];
   std::string reportUrl = "eosQuery://" + eos_endpoint + "//eos/wfe/passwd?mgm.pcmd=event&mgm.fid=" + attr["fxid"] +
-     "&mgm.logid=cta&mgm.event=sync::archived&mgm.workflow=default&mgm.path=/dummy_path&mgm.ruid=0&mgm.rgid=0&cta_archive_file_id=" +
-     xattrs["sys.archive.file_id"];
+    "&mgm.logid=cta&mgm.event=sync::archived&mgm.workflow=default&mgm.path=/dummy_path&mgm.ruid=0&mgm.rgid=0&cta_archive_file_id=" +
+    xattrs["sys.archive.file_id"];
   std::string destUrl = "root://" + eos_endpoint + "/" + attr["path"] + "?eos.lfn=fxid:" + attr["fxid"] +
-     "&eos.ruid=0&eos.rgid=0&eos.injection=1&eos.workflow=retrieve_written&eos.space=default";
+    "&eos.ruid=0&eos.rgid=0&eos.injection=1&eos.workflow=retrieve_written&eos.space=default";
 
   // WF
   notification.mutable_wf()->mutable_instance()->set_name(eos_instance);
@@ -257,10 +256,12 @@ int exceptionThrowingMain(int argc, char *const *const argv)
  * Start here
  */
 int main(int argc, char *const *const argv) {
-  try {    
+  try {
     return exceptionThrowingMain(argc, argv);
   } catch (XrdSsiPb::PbException &ex) {
     std::cerr << "Error in Google Protocol Buffers: " << ex.what() << std::endl;
+  } catch(cta::exception::CommandLineNotParsed &ex) {
+    std::cerr << ex.what() << std::endl;
   } catch (XrdSsiPb::XrdSsiException &ex) {
     std::cerr << "Error from XRootD SSI Framework: " << ex.what() << std::endl;
   } catch (std::exception &ex) {
diff --git a/cmdline/standalone_cli_tools/common/CmdLineArgs.cpp b/cmdline/standalone_cli_tools/common/CmdLineArgs.cpp
index 752f0e817a7b68bf083bb72ad6c169ab6b69a250..5f375997d0b88807a938c82e2b960e331fb16468 100644
--- a/cmdline/standalone_cli_tools/common/CmdLineArgs.cpp
+++ b/cmdline/standalone_cli_tools/common/CmdLineArgs.cpp
@@ -44,8 +44,8 @@ static struct option restoreFilesLongOption[] = {
   {nullptr, 0, nullptr, 0}
 };
 
-static struct option sendFileLongOption[] = {
-  {"instance", required_argument, nullptr, 'i'},
+static struct option sendEventLongOption[] = {
+  {"eos.instance", required_argument, nullptr, 'i'},
   {"eos.endpoint", required_argument, nullptr, 'e'},
   {"request.user", required_argument, nullptr, 'u'},
   {"request.group", required_argument, nullptr, 'g'},
@@ -74,7 +74,7 @@ static struct option changeStorageClassLongOption[] = {
 
 std::map<StandaloneCliTool, const option*> longopts = {
   {StandaloneCliTool::RESTORE_FILES, restoreFilesLongOption},
-  {StandaloneCliTool::CTA_SEND_EVENT, sendFileLongOption},
+  {StandaloneCliTool::CTA_SEND_EVENT, sendEventLongOption},
   {StandaloneCliTool::CTA_VERIFY_FILE, verifyFileLongOption},
   {StandaloneCliTool::CTA_CHANGE_STORAGE_CLASS, changeStorageClassLongOption},
 };
@@ -170,7 +170,7 @@ m_help(false), m_debug(false), m_standaloneCliTool{standaloneCliTool} {
       }
     case ':': // Missing parameter
       {
-        exception::CommandLineNotParsed ex;
+        exception::CommandLineNotParsed ex("", false);
         ex.getMessage() << "The -" << static_cast<char>(optopt) << " option requires a parameter";
         throw ex;
       }