diff --git a/fig/06-rmd-generate-figures.sh b/fig/06-rmd-generate-figures.sh
old mode 100755
new mode 100644
diff --git a/fig/12-plyr-generate-figures.sh b/fig/12-plyr-generate-figures.sh
old mode 100755
new mode 100644
diff --git a/instructor-notes.md b/instructor-notes.md
index de71e0484..83d1925ef 100644
--- a/instructor-notes.md
+++ b/instructor-notes.md
@@ -69,6 +69,21 @@ To prevent the learners from having to re-enter their password each time they pu
 $ git config --global credential.helper 'cache --timeout=10000000'
 ```
 
+## RStudio Color Preview
+
+RStudio has a feature to preview the color for certain named colors and hexadecimal colors. This may confuse or distract learners (and instructors) who are not expecting it.
+
+Mainly, this is likely to come up during the episode on "Data Structures" with the following code block:
+
+```r
+cats <- data.frame(coat = c("calico", "black", "tabby"),
+                    weight = c(2.1, 5.0, 3.2),
+                    likes_string = c(1, 0, 1))
+```
+
+This option can be turned off and on in the following menu setting:
+Tools -> Global Options -> Code -> Display -> Enable preview of named and hexadecimal colors (under "Syntax") 
+
 ## Pulling in Data
 
 The easiest way to get the data used in this lesson during a workshop is to have
diff --git a/md5sum.txt b/md5sum.txt
index 05402afe6..f5fc007eb 100644
--- a/md5sum.txt
+++ b/md5sum.txt
@@ -19,7 +19,7 @@
 "episodes/14-tidyr.Rmd" "1c59c3bea4cec5e0c47654a546294f07" "site/built/14-tidyr.md" "2024-01-04"
 "episodes/15-knitr-markdown.Rmd" "0c63ce92263a32f19fbec9f7b619b682" "site/built/15-knitr-markdown.md" "2024-01-04"
 "episodes/16-wrap-up.Rmd" "c5ce0d34a37b7a99624ad1d6ac482256" "site/built/16-wrap-up.md" "2024-01-04"
-"instructors/instructor-notes.md" "5ce85301c3e8d78b4b8682ae8e6bb7ff" "site/built/instructor-notes.md" "2024-01-04"
+"instructors/instructor-notes.md" "e61e7587564a6c4c11dbb6beea127764" "site/built/instructor-notes.md" "2024-01-12"
 "learners/discuss.md" "42ad66ab1907e030914dbb2a94376a47" "site/built/discuss.md" "2024-01-04"
 "learners/reference.md" "9496509797663e42d7dc4050d45628bd" "site/built/reference.md" "2024-01-04"
 "learners/setup.md" "f888f8a54b071715c0cf56896e650c00" "site/built/setup.md" "2024-01-04"