diff --git a/docs/source/tutorial1.ipynb b/docs/source/tutorial1.ipynb
index 018a3196e3ab11a62d02fcd2919c6c16711f5f5c..8b15c140b73e35cd432f583d55590b40c8191819 100644
--- a/docs/source/tutorial1.ipynb
+++ b/docs/source/tutorial1.ipynb
@@ -90,7 +90,7 @@
     "\n",
     "\n",
     "\n",
-    "### Assimilate observations with a prior given by previous forecasts\n",
+    "### Assimilate observations\n",
     "We start by importing some modules:\n",
     "```python\n",
     "import datetime as dt\n",