Doc tune-up
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 6da4c70..cdcda30 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1277,7 +1277,8 @@
* \param f_send write callback
* \param f_recv read callback
* \param f_recv_timeout blocking read callback with timeout.
- * The last argument is the timeout in milliseconds
+ * The last argument is the timeout in milliseconds,
+ * 0 means no timeout
*
* \note One of f_recv or f_recv_timeout can be NULL, in which case
* the other is used. If both are non-NULL, f_recv_timeout is