Adding comments

Change-Id: I55acc9927226cd6aaca0b7f60a2dd08ccc60dba7
Signed-off-by: José Bollo <jose.bollo@open.eurogiciel.org>
Fix typo

Change-Id: I65dd9f86af025f46c4017043117203e55bf6c4cb
Signed-off-by: José Bollo <jose.bollo@open.eurogiciel.org>