diff --git a/guess.c b/guess.c
index 3e5d120..3a53f4b 100644
--- a/guess.c
+++ b/guess.c
@@ -684,6 +684,9 @@ static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
             set_peg(&from->params, ui, ui->peg_cur, ui->colour_cur+1);
             ret = from;
         }
+    } else if (button == 'H' || button == 'h') {
+        ui->holds[ui->peg_cur] = 1 - ui->holds[ui->peg_cur];
+        ret = from;
     }
     return ret;
 }
diff --git a/puzzles.but b/puzzles.but
index 17d1003..42964ff 100644
--- a/puzzles.but
+++ b/puzzles.but
@@ -1076,7 +1076,7 @@ after marking.
 Alternatively, with the keyboard, the up and down cursor keys can be
 used to select a peg colour, the left and right keys to select a
 peg position, and the space bar to place a peg of the selected colour
-in the chosen position.
+in the chosen position. \q{H} adds a hold marker.
 
 When the guess is complete, the feedback pegs will be highlighted;
 clicking on these (or moving the peg cursor to them with the arrow keys