diff --git a/docs/sitemap.xml b/docs/sitemap.xml
index 7be19fd..e7721c0 100644
--- a/docs/sitemap.xml
+++ b/docs/sitemap.xml
@@ -82,7 +82,7 @@
   </url>
   <url>
     <loc>http://rafalab.dfci.harvard.edu/dsbook-part-1/wrangling/string-processing.html</loc>
-    <lastmod>2023-11-24T17:07:45.556Z</lastmod>
+    <lastmod>2023-11-24T17:10:41.829Z</lastmod>
   </url>
   <url>
     <loc>http://rafalab.dfci.harvard.edu/dsbook-part-1/wrangling/text-mining.html</loc>
diff --git a/wrangling/data-table-wrangling.qmd b/wrangling/data-table-wrangling.qmd
index 0f831f6..7f9a693 100644
--- a/wrangling/data-table-wrangling.qmd
+++ b/wrangling/data-table-wrangling.qmd
@@ -29,7 +29,7 @@ filename <- file.path(path, "fertility-two-countries-example.csv")
 
 If in **tidyeverse** we  write
 
-```{r}
+```{r, message=FALSE}
 wide_data <- read_csv(filename)
 new_tidy_data <- wide_data |>
   pivot_longer(-1, names_to = "year", values_to = "fertility")