mercurial/help/templates.txt

--- a/mercurial/help/templates.txt	Sat Jun 13 00:15:22 2015 +0900
+++ b/mercurial/help/templates.txt	Sat Jun 13 19:49:54 2015 +0900
@@ -47,6 +47,10 @@
 
 - expr % "{template}"
 
+As seen in the above example, "{template}" is interpreted as a template.
+To prevent it from being interpreted, you can use an escape character "\{"
+or a raw string prefix, "r'...'".
+
 Some sample command line templates:
 
 - Format lists, e.g. files::