diff --git a/soil_tutorial.ipynb b/soil_tutorial.ipynb
index 421d116..5e11d00 100644
--- a/soil_tutorial.ipynb
+++ b/soil_tutorial.ipynb
@@ -593,7 +593,7 @@
    "source": [
     "This model is based on the New Spread Model\n",
     "M2 [1] which also refers to the cascade model [2]. Agents, usually Twit-\n",
-    "ter users, have three states regarding a rumour: neutral (initial state),\n",
+    "ter users, have four states regarding a rumour: neutral (initial state),\n",
     "infected, vaccinated and cured.\n",
     "\n",
     "An agent becomes: infected when believes the rumour; vaccinated when is\n",