diff --git a/src/core/libs/serdes_nav_message.h b/src/core/libs/serdes_nav_message.h
index 1682a5872..b831267b1 100644
--- a/src/core/libs/serdes_nav_message.h
+++ b/src/core/libs/serdes_nav_message.h
@@ -83,7 +83,7 @@ public:
         navmsg_.set_prn(nav_msg_packet->prn);
         navmsg_.set_tow_at_current_symbol_ms(nav_msg_packet->tow_at_current_symbol_ms);
         navmsg_.set_nav_message(nav_msg_packet->nav_message);
-        
+
         navmsg_.SerializeToString(&data);
 
         return data;
diff --git a/src/utils/nav-listener/README.md b/src/utils/nav-listener/README.md
index d4a6f744a..147e9717f 100644
--- a/src/utils/nav-listener/README.md
+++ b/src/utils/nav-listener/README.md
@@ -1,14 +1,23 @@
+<!-- prettier-ignore-start -->
+[comment]: # (
+SPDX-License-Identifier: BSD-3-Clause
+)
+
+[comment]: # (
+SPDX-FileCopyrightText: 2021 Carles Fernandez-Prades <carles.fernandez@cttc.es>
+)
+<!-- prettier-ignore-end -->
+
 # nav_msg_listener
 
 Simple application that retrieves decoded navigation messages produced by
 GNSS-SDR and prints them in a terminal. This is only for demonstration purposes,
 as a example on how to retrieve data using the `nav_message.proto` file.
 
-
 # Build the software
 
-This software requires [Boost](https://www.boost.org/) and [Protocol
-Buffers](https://developers.google.com/protocol-buffers).
+This software requires [Boost](https://www.boost.org/) and
+[Protocol Buffers](https://developers.google.com/protocol-buffers).
 
 In a terminal, type:
 
@@ -18,7 +27,6 @@ $ cmake ..
 $ make
 ```
 
-
 ## Usage
 
 In order to tell GNSS-SDR to generate those messages, you need to include the
diff --git a/src/utils/nav-listener/nav_msg_udp_listener.h b/src/utils/nav-listener/nav_msg_udp_listener.h
index 80dd080f4..a305d83f0 100644
--- a/src/utils/nav-listener/nav_msg_udp_listener.h
+++ b/src/utils/nav-listener/nav_msg_udp_listener.h
@@ -22,7 +22,7 @@
 class Nav_Msg_Udp_Listener
 {
 public:
-    Nav_Msg_Udp_Listener(unsigned short port);
+    explicit Nav_Msg_Udp_Listener(unsigned short port);
     bool print_content();
 
 private: