diff --git a/common b/common
index 5d456e765..74d5ca761 160000
--- a/common
+++ b/common
@@ -1 +1 @@
-Subproject commit 5d456e7657304986b1d70a63619459d12d828983
+Subproject commit 74d5ca76144d2faa7d7d0c0c6d5d8d94f9597fb2
diff --git a/lib/formats/iotagent_ul.cpp b/lib/formats/iotagent_ul.cpp
index c65ba16f9..4e22c8e66 100644
--- a/lib/formats/iotagent_ul.cpp
+++ b/lib/formats/iotagent_ul.cpp
@@ -1,4 +1,6 @@
-/** UltraLight format for FISMEP project.
+/** UltraLight 2.0 format as used by FIWARE IotAgent.
+ *
+ * See: https://fiware-iotagent-ul.readthedocs.io/en/latest/usermanual/index.html
  *
  * @author Iris Koester <ikoester@eonerc.rwth-aachen.de>
  * @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
diff --git a/tests/unit/io.cpp b/tests/unit/io.cpp
index 720dde49b..cbd764896 100644
--- a/tests/unit/io.cpp
+++ b/tests/unit/io.cpp
@@ -227,7 +227,7 @@ ParameterizedTest(Param *p, io, lowlevel, .init = init_memory)
 
 	Logger logger = logging.get("test:io:lowlevel");
 
-	logger->info("Running test for format={}, cnt={}", p->fmt.c_str(), p->cnt);
+	logger->info("Running test for format={}, cnt={}", p->fmt, p->cnt);
 
 	struct format_type *f;
 
@@ -311,7 +311,7 @@ ParameterizedTest(Param *p, io, highlevel, .init = init_memory)
 
 	Logger logger = logging.get("test:io:highlevel");
 
-	logger->info("Running test for format={}, cnt={}", p->fmt.c_str(), p->cnt);
+	logger->info("Running test for format={}, cnt={}", p->fmt, p->cnt);
 
 	return;