diff --git a/slides/gen_index.sh b/slides/gen_index.sh
index 5c72edf6c43ccbb286b6af2401b7c0e789f0a267..9a1a026f1be11edac606857e902cd670652ca589 100755
--- a/slides/gen_index.sh
+++ b/slides/gen_index.sh
@@ -38,7 +38,7 @@ for i in *.md; do
         fail "Error title field not found"
     fi
     i="${i%.*}"
-    class="[${date} ${comp}](${PREFIX}${i}.pdf)"
+    class="[${date}: ${comp}](${PREFIX}${i}.pdf)"
     classes+=("$class")
 done
 IFS=$'\n'
diff --git a/slides/intro.md b/slides/intro.md
index 2697980ea08ddb4083952b2cf8ed63a6db909188..67c328113a63b4af40f28257fd4fbec66415a316 100644
--- a/slides/intro.md
+++ b/slides/intro.md
@@ -1,6 +1,6 @@
 ---
 title: "Introduction générale"
-date: "2022-09-21"
+date: "2022-09-20"
 ---
 
 # La hotline