diff --git a/notebooks/pyasdf_tests.ipynb b/notebooks/pyasdf_tests.ipynb
index 2f8a23cc..32c1e363 100644
--- a/notebooks/pyasdf_tests.ipynb
+++ b/notebooks/pyasdf_tests.ipynb
@@ -327,7 +327,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Extract data from an exisitng ASDF file"
+    "## Extract data from an existing ASDF file"
    ]
   },
   {