diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index e09213d383..dc989ccbc0 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -307,6 +307,15 @@ ttymode(VALUE io, VALUE (*func)(VALUE), void (*setter)(conmode *, void *), void
  *
  * will read and return a line without echo back and line editing.
  *
+ * The parameter +min+ specifies the minimum number of bytes that
+ * should be received when the read operation is performed. (default:
+ * 1)
+ *
+ * The paramter +time+ specifies the timeout in _seconds_, with a
+ * precision of 1/10 of a second. (default: 0)
+ *
+ * Refer to the manual page of termios for further details.
+ *
  * You must require 'io/console' to use this method.
  */
 static VALUE
@@ -324,6 +333,8 @@ console_raw(int argc, VALUE *argv, VALUE io)
  *
  * If the terminal mode needs to be back, use io.raw { ... }.
  *
+ * See IO#raw for details on the parameters.
+ *
  * You must require 'io/console' to use this method.
  */
 static VALUE
@@ -397,6 +408,8 @@ getc_call(VALUE io)
  *
  * Reads and returns a character in raw mode.
  *
+ * See IO#raw for details on the parameters.
+ *
  * You must require 'io/console' to use this method.
  */
 static VALUE