Fix link to slides.

diff --git a/activities.mdwn b/activities.mdwn
index 59885a2..4218fbf 100644 (file)
--- a/activities.mdwn
+++ b/activities.mdwn
@@ -9,7 +9,7 @@ not listed here, we would also like to hear about it.
 
 * [OHM2013](https://ohm2013.org/site/),
   July 31-August 4, 2013, near Alkmaar, The Netherlands.
-  There was a lightning talk about tinc ([slides](presentations/OHM2013/The_tinc_VPN.pdf)) in T2 at 15:55 on August 1, a talk about [ChaosVPN](http://wiki.hamburg.ccc.de/index.php/ChaosVPN) in T6 at 13:00 on August 1,
+  There was a lightning talk about tinc ([slides](/presentations/OHM2013/The_tinc_VPN.pdf)) in T2 at 15:55 on August 1, a talk about [ChaosVPN](http://wiki.hamburg.ccc.de/index.php/ChaosVPN) in T6 at 13:00 on August 1,
   and combined workshop for tinc and ChaosVPN at the [Milliways village](https://ohm2013.org/wiki/Village:Milliways).
 
 * [Chaos Communication Camp](http://events.ccc.de/camp/2011/),