diff --git a/rsync.1.md b/rsync.1.md

index ec971ecc..7bb4c5a1 100644

--- a/rsync.1.md

+++ b/rsync.1.md

@@ -949,7 +949,9 @@ your home directory (remove the '=' for that).

     existing content in the file (it only verifies the content that it is

     appending).  Rsync skips any files that exist on the receiving side that

     are not shorter than the associated file on the sending side (which means

-    that new files are trasnferred).

+    that new files are trasnferred).  It also skips any files whose size on the

+    sending side gets shorter during the send negotiations (rsync warns about a

+    "diminished" file when this happens).

     This does not interfere with the updating of a file's non-content

     attributes (e.g.  permissions, ownership, etc.) when the file does not need

diff --git a/sender.c b/sender.c

index 94761c26..9cfca134 100644

--- a/sender.c

+++ b/sender.c

@@ -362,6 +362,16 @@ void send_files(int f_in, int f_out)

 			exit_cleanup(RERR_FILEIO);

 		}

+		if (append_mode > 0 && st.st_size < F_LENGTH(file)) {

+			rprintf(FWARNING, "skipped diminished file: %s\n",

+				full_fname(fname));

+			free_sums(s);

+			close(fd);

+			if (protocol_version >= 30)

+				send_msg_int(MSG_NO_SEND, ndx);

+			continue;

+		}

+

 		if (IS_DEVICE(st.st_mode) && st.st_size == 0)

 			st.st_size = get_device_size(fd, fname);