diff --git a/01-r-basics.md b/01-r-basics.md
index 9a1daf23..1d3c20f4 100644
--- a/01-r-basics.md
+++ b/01-r-basics.md
@@ -689,7 +689,7 @@ In the square brackets you place the name of the vector followed by the comparis
 | \==                  | exactly equal to                                                                                                                                                                                                                            |
 | !=                  | not equal to                                                                                                                                                                                                                                |
 | !x                  | not x                                                                                                                                                                                                                                       |
-| a | b               | a or b                                                                                                                                                                                                                                      |
+| a \| b               | a or b                                                                                                                                                                                                                                      |
 | a \& b               | a and b                                                                                                                                                                                                                                     |
 
 :::::::::::::::::::::::::::::::::::::::::  callout
diff --git a/md5sum.txt b/md5sum.txt
index 4cd1bd76..98b5fa62 100644
--- a/md5sum.txt
+++ b/md5sum.txt
@@ -4,7 +4,7 @@
 "config.yaml" "b91cd97fa3b408bd1ac0a00e67ab3219" "site/built/config.yaml" "2023-09-13"
 "index.md" "7f9c30e6487338a0c3f8ecc4018873ab" "site/built/index.md" "2023-09-13"
 "episodes/00-introduction.Rmd" "23afc306d3ca75b46cbebfe21e0d060a" "site/built/00-introduction.md" "2023-09-13"
-"episodes/01-r-basics.Rmd" "1acede0430da5a5235c3cfa39b0156e4" "site/built/01-r-basics.md" "2023-09-13"
+"episodes/01-r-basics.Rmd" "a3c3f96b0da4eed5afb6359d70201f04" "site/built/01-r-basics.md" "2023-10-11"
 "episodes/02-data-prelude.Rmd" "ab2b1fd3cdaae919f9e409f713a0a8ad" "site/built/02-data-prelude.md" "2023-09-13"
 "episodes/03-basics-factors-dataframes.Rmd" "1e9fafb7ff3365395cd21c3f22bdc9e6" "site/built/03-basics-factors-dataframes.md" "2023-09-13"
 "episodes/04-bioconductor-vcfr.Rmd" "10eb69b4697d7ecb9695d36c0d974208" "site/built/04-bioconductor-vcfr.md" "2023-09-13"