diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index 4808f247..610cbd83 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -876,7 +876,6 @@ tcp_build_wnd_scale_option(u32_t *opts)
 #endif
 
 /**
- * @ingroup tcp_raw
  * Send an ACK without data.
  *
  * @param pcb Protocol control block for the TCP connection to send the ACK
@@ -1469,7 +1468,6 @@ tcp_rexmit_fast(struct tcp_pcb *pcb)
 
 
 /**
- * @ingroup tcp_raw
  * Send keepalive packets to keep a connection active although
  * no data is sent over it.
  *