docs/i3bar-protocol: Mention skipping blocks with empty full_text

Closes #3405.

diff --git a/docs/i3bar-protocol b/docs/i3bar-protocol
index 8b7d2af76ccdefe0a1a99e78843a960ce4f55029..62706f74359488688bafa5a83e702aa0af5040f3 100644 (file)
--- a/docs/i3bar-protocol
+++ b/docs/i3bar-protocol
@@ -118,7 +118,8 @@ click_events::
 
 full_text::
        The +full_text+ will be displayed by i3bar on the status line. This is the
-       only required key.
+       only required key. If +full_text+ is an empty string, the block will be
+       skipped.
 short_text::
        Where appropriate, the +short_text+ (string) entry should also be
        provided. It will be used in case the status line needs to be shortened