docs/ipc: Document the 'primary' flag

Resolves #2697

diff --git a/docs/ipc b/docs/ipc
index 466b6596d77c0d5d9e668c821340b20e095d2986..026e434d9c1b8c5d057d4fe03c5d541f906ab4d9 100644 (file)
--- a/docs/ipc
+++ b/docs/ipc
@@ -232,6 +232,8 @@ name (string)::
        The name of this output (as seen in +xrandr(1)+). Encoded in UTF-8.
 active (boolean)::
        Whether this output is currently active (has a valid mode).
+primary (boolean)::
+       Whether this output is currently the primary output.
 current_workspace (string)::
        The name of the current workspace that is visible on this output. +null+ if
        the output is not active.