diff --git a/notebooks/index.ipynb b/notebooks/index.ipynb
index d65e88553..79da60c8b 100644
--- a/notebooks/index.ipynb
+++ b/notebooks/index.ipynb
@@ -43,7 +43,7 @@
"source": [
"## Who this Book is for\n",
"\n",
- "This work is designed as a _textbook_ for a course in software testing; as _supplementary material_ in a software testing or software engineering course; and as a _resource for software developers_. We cover random fuzzing, mutation-based fuzzing, grammar-based test generation, symbolic testing, and much more, illustrating all techniques with code examples that you can try out yourself."
+ "This work is designed as a _textbook_ for a course in software testing or security testing; as _supplementary material_ in a software testing, security testing, or software engineering course; and as a _resource for software developers_. We cover random fuzzing, mutation-based fuzzing, grammar-based test generation, symbolic testing, and much more, illustrating all techniques with code examples that you can try out yourself."
]
},
{
@@ -52,7 +52,7 @@
"source": [
"## News\n",
"\n",
- "This book is _work in progress._ All chapters planned are out now, but we keep on refining the material with [minor and major releases.](ReleaseNotes.ipynb) To get notified on updates, follow us on Mastodon.\n",
+ "This book is _work in progress._ All chapters planned are out now, but we keep on refining text and code with [minor and major releases.](ReleaseNotes.ipynb) To get notified on updates, follow us on Mastodon.\n",
"\n",
"