diff --git a/src/core/iomgr/fd_posix.c b/src/core/iomgr/fd_posix.c
index 4cbc46cd179..3ff27631be0 100644
--- a/src/core/iomgr/fd_posix.c
+++ b/src/core/iomgr/fd_posix.c
@@ -347,16 +347,19 @@ void grpc_fd_end_poll(grpc_fd_watcher *watcher, int got_read, int got_write) {
 
   gpr_mu_lock(&fd->watcher_mu);
   if (watcher == fd->read_watcher) {
+    /* remove read watcher, kick if we still need a read */
     was_polling = 1;
     kick |= !got_read;
     fd->read_watcher = NULL;
   }
   if (watcher == fd->write_watcher) {
+    /* remove write watcher, kick if we still need a write */
     was_polling = 1;
     kick |= !got_write;
     fd->write_watcher = NULL;
   }
   if (!was_polling) {
+    /* remove from inactive list */
     watcher->next->prev = watcher->prev;
     watcher->prev->next = watcher->next;
   }