diff --git a/2019/2019-10-10_advancedGitTraining-SIU/slides/ignore.md b/2019/2019-10-10_advancedGitTraining-SIU/slides/ignore.md
new file mode 100644
index 0000000000000000000000000000000000000000..7015bcd0695709670a97ef9365db11ff52c38962
--- /dev/null
+++ b/2019/2019-10-10_advancedGitTraining-SIU/slides/ignore.md
@@ -0,0 +1,17 @@
+# Ignore files
+
+In the file `.gitignore`, all untracked files that should be ignored by `git` are listed:
+```
+.DS_Store
+data
+*.csv
+```
+
+If you want to exclude certain files from this list:
+```
+!*.yml
+config/*.yml
+```
+This tracks changes in all yml file, but not in the `config` folder.
+
+Examples: www.gitignore.io
\ No newline at end of file
diff --git a/2019/2019-10-10_advancedGitTraining-SIU/slides/list.json b/2019/2019-10-10_advancedGitTraining-SIU/slides/list.json
index d14c9ece6715e51855ca0da8c485cd55fbd3a13a..fdf6a0f656a16a408409b37117a58d811c298f92 100644
--- a/2019/2019-10-10_advancedGitTraining-SIU/slides/list.json
+++ b/2019/2019-10-10_advancedGitTraining-SIU/slides/list.json
@@ -2,6 +2,7 @@
     { "filename": "index.md" },
     { "filename": "overview.md" },
     { "filename": "gettingStarted.md" },
+    { "filename": "ignore.md" },
     { "filename": "amend.md" },
     { "filename": "reset.md" },
     { "filename": "revert.md" },