diff --git a/src/odoors/ODKrnl.c b/src/odoors/ODKrnl.c
index c16bf98a456687386dca6e2745afaf93d79c888c..7cb545a8064c686b5cd5c01149a4bf1caa779122 100644
--- a/src/odoors/ODKrnl.c
+++ b/src/odoors/ODKrnl.c
@@ -175,6 +175,7 @@ tODResult ODKrnlInitialize(void)
    tODResult Result = kODRCSuccess;
    
 #ifdef ODPLAT_NIX
+   /* Block SIGHUP for carrier detect use */
    sigemptyset(&block);
    sigaddset(&block,SIGHUP);
    sigprocmask(SIG_BLOCK,&block,NULL);