diff --git a/.gitignore b/.gitignore
index 71e12b2ed675befc93827a4fb08b76ffc2060505..75edcb5263d9fd60b44b1c26a0c9bf2a7f760b76 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 # put this line in comment when presentation is finished
 # (no need to clutter repo history with intermediate slides PDFs)
-**/presentation.pdf
+# **/presentation.pdf
 
 # emacs gitignore (_region_: auctex preview files)
 *.el
diff --git a/presentation/presentation.pdf b/presentation/presentation.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..6262a30f579b865b0e8471b4e6d21d4130cb2ff1
--- /dev/null
+++ b/presentation/presentation.pdf
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:95855c9456564e74f54d25be65ba18e554356ad1810d7dc29d9c2a382b1690ed
+size 6436943