diff --git a/man3/termios.3 b/man3/termios.3
index 7d738d457..3f5760716 100644
--- a/man3/termios.3
+++ b/man3/termios.3
@@ -728,11 +728,20 @@ requested fewer bytes than are available in the current line of input,
 then only as many bytes as requested are read,
 and the remaining characters will be available for a future
 .BR read (2).
+.IP * 2
+The maximum line length is 4096 chars (including the line termination
+char); lines longer than 4096 chars are truncated. After 4095 chars,
+input data is still processed but not stored. Overflow processing
+ensures the tty can always receive more input until at least one
+line can be read.
 .PP
 In noncanonical mode input is available immediately (without
 the user having to type a line-delimiter character),
 no input processing is performed,
 and line editing is disabled.
+The read buffer will only accept 4095 chars; this provides the
+necessary space for a newline char if the input mode is switched
+to canonical.
 The settings of MIN
 .RI ( c_cc[VMIN] )
 and TIME