diff --git a/masking_and_moments/masking_and_moments_guide.ipynb b/masking_and_moments/masking_and_moments_guide.ipynb
index bc649ef..cebe064 100644
--- a/masking_and_moments/masking_and_moments_guide.ipynb
+++ b/masking_and_moments/masking_and_moments_guide.ipynb
@@ -331,7 +331,7 @@
   },
   {
    "source": [
-    "Next, we will label connected regions in `low_snr_mask` and label them. `low_snr_mask` and `high_snr_mask` are both dask arrays. We define regions as connected as 27-connected, meaning all edge and corner connections are included in 3D. The equivalent in 2D is 8-connected and would have a structure element like:\n",
+    "Next, we will label connected regions in `low_snr_mask` and label them. `low_snr_mask` and `high_snr_mask` are both dask arrays. We define regions as connected as 26-connected, meaning all edge and corner connections are included in 3D. The equivalent in 2D is 8-connected and would have a structure element like:\n",
     "\n",
     "```\n",
     "[1, 1, 1]\n",