Update README.md

This fixes some typos in the README

1 files changed, 19 insertions, 18 deletions

diff --git a/README.md b/README.md
index c2c650d..5d46e5e 100644
--- a/README.md
+++ b/README.md
@@ -18,23 +18,23 @@ a look at the examples/ folder.
   3. user creates an instance of prototype.Experiment class, passing
     the testbed instance and a list of Node instances
 
-        * At the end of the base Experiment constructor, the
-          generate function is called to generate information about
-          per-node IPCPs, registrations and enrollment, ready to be
-          used by the plugins
+    * At the end of the base Experiment constructor, the
+      generate function is called to generate information about
+      per-node IPCPs, registrations and enrollment, ready to be
+      used by the plugins
 
   4. user calls run() on the prototype.Experiment instance:
 
-        * First, run() calls Testbed.swap_in(), passing the
-          Experiment, and filling in the missing information
+    * First, run() calls Testbed.swap_in(), passing the
+      Experiment, and filling in the missing information
 
-        * Second, run() calls a prototype-specific setup function,
-          to create the required IPCPs, perform registrations,
-          enrollments, etc.
+    * Second, run() calls a prototype-specific setup function,
+      to create the required IPCPs, perform registrations,
+      enrollments, etc.
 
-        * Third, perform tests (TODO)
+    * Third, perform tests (TODO)
 
-        * Fourth, run() calls Testbed.swap_out()
+    * Fourth, run() calls Testbed.swap_out()
 
 ## Installation
 
@@ -72,7 +72,7 @@ a look at the examples/ folder.
 
    In order to use the jFed testbed, a user first needs to download
    his/her key from
-   [https://authority.ilabt.iminds.be/](https://www.youtube.com/watch?v=dQw4w9WgXcQ/)
+   [https://authority.ilabt.iminds.be/](https://authority.ilabt.iminds.be/)
    After logging in, click on *Download your certificate*. Save the
    contents in a file (for example cert.pem). A jFed testbed instance
    is defined as follows:
@@ -83,15 +83,16 @@ a look at the examples/ folder.
 
    Here the experiment name is rochefort10, the user's name is
    ricksanchez, and the certificate can be found in
-   /home/morty/cert.pem.
+   /home/morty/cert.pem. Please use an absolute path for cert_file for
+   now.
 
    Before running the experiment it is wise to use an SSH agent to
    avoid having to enter the passphrase for every login to a node by
-   the framework. (Apart from asking for the passphrase to login to
-   the nodes, the framework will always ask for the passphrase since
-   it is needed by the jFed CLI as well.) In order to start an SSH
-   agent and to add the certificate, simply perform the following
-   commands:
+   the framework if you are not on an IPv6 enabled network. (Apart
+   from asking for the passphrase to login to the nodes, the framework
+   will always ask for the passphrase since it is needed by the jFed
+   CLI as well.) In order to start an SSH agent and to add the
+   certificate, simply perform the following commands:
 
        eval `ssh-agent`
        ssh-add /home/morty/cert.pem