diff --git a/src/core/tcp_in.c b/src/core/tcp_in.c
index 0b95b9e1..829166d5 100644
--- a/src/core/tcp_in.c
+++ b/src/core/tcp_in.c
@@ -930,7 +930,7 @@ tcp_oos_insert_segment(struct tcp_seg *cseg, struct tcp_seg *next)
 
 /**
  * Called by tcp_process. Checks if the given segment is an ACK for outstanding
- * data, and if so frees the memory of the buffered data. Next, is places the
+ * data, and if so frees the memory of the buffered data. Next, it places the
  * segment on any of the receive queues (pcb->recved or pcb->ooseq). If the segment
  * is buffered, the pbuf is referenced by pbuf_ref so that it will not be freed until
  * it has been removed from the buffer.