diff --git a/notebooks/t3ss_geometry.ipynb b/notebooks/t3ss_geometry.ipynb
index 8319e1edcc19899fb1b0bb54aeaae0d723586e75..934252c00f8aac4568acffc496643a2ab1ef0f1a 100644
--- a/notebooks/t3ss_geometry.ipynb
+++ b/notebooks/t3ss_geometry.ipynb
@@ -6,7 +6,7 @@
    "source": [
     "# T3SS measurments\n",
     "\n",
-    "This notebook is used to measure the measurments of T3SS from three manually determined: 0 (inner membrane/basal body interface ), 1 (basal body/needle junction or basal body/bacteria outer membrane junction for the basal body only) and 2 (needle tip or vacuole membrane/T3SS tip interface, not always present).\n",
+    "This notebook is used to perform measurments of T3SS from three manually determined: 0 (inner membrane/basal body interface ), 1 (basal body/needle junction or basal body/bacteria outer membrane junction for the basal body only) and 2 (needle tip or vacuole membrane/T3SS tip interface, not always present).\n",
     "\n",
     "The input to this notebook is an IMOD .mod file and the corresponding tomograms.\n",
     "\n",