diff --git a/IO.cpp b/IO.cpp
index 0d55b60..b9fc5c0 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -164,7 +164,7 @@ void IO::process()
             p25RX.databit(bit);
         }
         else if (m_modemState == STATE_NXDN) {
-            /* Next Generation Digital Narrowband */
+            /** Next Generation Digital Narrowband */
             nxdnRX.databit(bit);
         }
     }
diff --git a/SerialPort.cpp b/SerialPort.cpp
index ab5949d..d9ec94b 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -363,7 +363,7 @@ void SerialPort::process()
                     }
                     break;
 
-                /* Next Generation Digital Narrowband */
+                /** Next Generation Digital Narrowband */
                 case CMD_NXDN_DATA:
                     if (m_nxdnEnable) {
                         if (m_modemState == STATE_IDLE || m_modemState == STATE_NXDN)