mercurial/help/templates.txt

--- a/mercurial/help/templates.txt	Sat Sep 09 19:13:25 2017 +0900
+++ b/mercurial/help/templates.txt	Sat Sep 09 19:32:56 2017 +0900
@@ -72,6 +72,11 @@
 To prevent it from being interpreted, you can use an escape character ``\{``
 or a raw string prefix, ``r'...'``.
 
+The dot operator can be used as a shorthand for accessing a sub item:
+
+- ``expr.member`` is roughly equivalent to ``expr % "{member}"`` if ``expr``
+  returns a non-list/dict. The returned value is not stringified.
+
 Aliases
 =======