diff --git a/doc/google_calendar.md b/doc/google_calendar.md
index 35c89b0..9ecba32 100644
--- a/doc/google_calendar.md
+++ b/doc/google_calendar.md
@@ -1,5 +1,6 @@
 # Google calendar
-## We have several google calendars used for several purposes:
+
+We have several google calendars used for several purposes:
 
 [CPP-LAB : all events](https://calendar.google.com/calendar?cid=a21kcmMybWp1MXNkaDJ2dGZiMDZkbjc2ZmtAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ) → for most of the information