Doc update

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, <a href=\"https://mastodon.social/invite/3CvrkW9t\">follow us on Mastodon</a>.\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, <a href=\"https://mastodon.social/invite/3CvrkW9t\">follow us on Mastodon</a>.\n",
     "\n",
     "<!--\n",
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