devblog

1 files changed, 14 insertions, 1 deletions

diff --git a/doc/internals.mdwn b/doc/internals.mdwn
index 4ed8001d4..7d39b1068 100644
--- a/doc/internals.mdwn
+++ b/doc/internals.mdwn
@@ -176,10 +176,23 @@ File format is identical to preferred-content.log.
 Contains standard preferred content settings for groups. (Overriding or
 supplementing the ones built into git-annex.)
 
-The file format is one line per group, staring with a timestamp, then a
+The file format is one line per group, starting with a timestamp, then a
 space, then the group name followed by a space and then the preferred
 content expression.
 
+## `export.log`
+
+Tracks what trees have been exported to special remotes by
+[[git-annex-export]](1).
+
+Each line starts with a timestamp, then the uuid of the special remote,
+followed by the sha1 of the tree that was exported to that special remote.
+
+(The exported tree is also grafted into the git-annex branch, at
+`export.tree`, to prevent git from garbage collecting it. However, the head
+of the git-annex branch should never contain such a grafted in tree;
+the grafted tree is removed in the same commit that updates `export.log`.)
+
 ## `aaa/bbb/*.log`
 
 These log files record [[location_tracking]] information