diff --git a/src/include/lwip/sockets.h b/src/include/lwip/sockets.h
index 97897c89..19766035 100644
--- a/src/include/lwip/sockets.h
+++ b/src/include/lwip/sockets.h
@@ -178,7 +178,7 @@ struct lwip_setgetsockopt_data {
  */
 struct linger {
        int l_onoff;                /* option on/off */
-       int l_linger;               /* linger time */
+       int l_linger;               /* linger time in seconds */
 };
 
 /*