diff --git a/examples/client/client.c b/examples/client/client.c
index 5115de4e5..21b4ccd91 100644
--- a/examples/client/client.c
+++ b/examples/client/client.c
@@ -101,7 +101,7 @@ static void Usage(void)
     printf("-g          Send server HTTP GET\n");
     printf("-u          Use UDP DTLS\n");
     printf("-m          Match domain name in cert\n");
-    printf("-n          Use non-blocking sockets\n");
+    printf("-N          Use Non-blocking sockets\n");
     printf("-r          Resume session\n");
 }
 
diff --git a/examples/server/server.c b/examples/server/server.c
index a0a09c684..10a77853d 100644
--- a/examples/server/server.c
+++ b/examples/server/server.c
@@ -96,7 +96,7 @@ static void Usage(void)
     printf("-b          Bind to any interface instead of localhost only\n");
     printf("-s          Use pre Shared keys\n");
     printf("-u          Use UDP DTLS\n");
-    printf("-N          Use non-blocking sockets\n");
+    printf("-N          Use Non-blocking sockets\n");
 }