diff --git a/notebooks/t3ss_geometry.ipynb b/notebooks/t3ss_geometry.ipynb
index 7092963b9684640774d6d88c2f8cfb2f0fb3379a..8319e1edcc19899fb1b0bb54aeaae0d723586e75 100644
--- a/notebooks/t3ss_geometry.ipynb
+++ b/notebooks/t3ss_geometry.ipynb
@@ -4,9 +4,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# T3SS geometry\n",
+    "# T3SS measurments\n",
     "\n",
-    "This notebook is used to measure the geometry of T3SS from three manually determined: 0 (close to inner membrane), 1 (close to OM) and 2(outside of the cell, not always present).\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",
     "\n",
     "The input to this notebook is an IMOD .mod file and the corresponding tomograms.\n",
     "\n",