diff --git a/.gitignore b/.gitignore
index eb3b68338ae632f3bb23af50769a689fe15ce887..2daba2284e8ef42af5e37649a07c4adc61bc1f08 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..b808e648c8d3cdcb77151f65b55c5393f38f7cd4
--- /dev/null
+++ b/presentation/presentation.pdf
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b2cfd675c88248172b16fd5c84911b5d03d79df05b6f283cfd5aaa6243c74850
+size 21759575