diff --git a/ipynb/xkcd-Name-Dominoes.ipynb b/ipynb/xkcd-Name-Dominoes.ipynb
index 03c944b..e344460 100644
--- a/ipynb/xkcd-Name-Dominoes.ipynb
+++ b/ipynb/xkcd-Name-Dominoes.ipynb
@@ -28,7 +28,7 @@
     "- **`try_one(tiles, board, frontier)`**: pop a location off the frontier, and try to find some tile that can legally put one of its halves there; when found, `put` the tile there, and remove it from `tiles`.\n",
     "- **`legal(name, loc, board)`**: a name can be placed if the location is empty, and there are no conflicts with any neighboring location.\n",
     "- **`neighbors(loc, board)`**: returns the (up to 4) neighbors of a location that are on the board.\n",
-    "- **`put_tile(board, loc0, loc1, tile, frontier)`**: places a tile on the board across `loc0` and `loc`; update the `frontier` to say that the just-covered locations are no longer in the frontier, but the empty neighbors of the tile are.\n",
+    "- **`put_tile(board, loc0, loc1, tile, frontier)`**: places a tile on the board across `loc0` and `loc1`; update the `frontier` to say that the just-covered locations are no longer in the frontier, but the empty neighbors of the tile are.\n",
     "- **`shuffle(items)`**: used to randomize lists; calls `random.shuffle` and returns the result.\n",
     "\n",
     "# The Code"