diff --git a/notebooks/chap01.ipynb b/notebooks/chap01.ipynb
index 3d998f98..0bfa6d9d 100644
--- a/notebooks/chap01.ipynb
+++ b/notebooks/chap01.ipynb
@@ -165,7 +165,7 @@
     "\n",
     "* `partyid`: Political party affiliation, Democrat, Independent, or Republican.\n",
     "\n",
-    "* `indus10`: [Code](https://www.census.gov/cgi-bin/sssd/naics/naicsrch?chart=2007) for the industry the respondent works in.\n",
+    "* `indus10`: [Code](https://www.census.gov/topics/employment/industry-occupation/guidance/indexes.html) for the industry the respondent works in.\n",
     "\n",
     "Let's look at these variables in more detail, starting with `indus10`."
    ]