From 6983e8d8001f8315527ec9c70b290c034779bedf Mon Sep 17 00:00:00 2001
From: Slava Kim <imslavko@gmail.com>
Date: Sat, 16 May 2015 23:49:55 -0700
Subject: [PATCH] Update Spacebars REAMDE: mention nested sub-expressions

---
 packages/spacebars/README.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/packages/spacebars/README.md b/packages/spacebars/README.md
index eeabe0f9d0..65f278608a 100644
--- a/packages/spacebars/README.md
+++ b/packages/spacebars/README.md
@@ -495,6 +495,25 @@ We can write {{foo}} and it doesn't matter.
 
 Comment tags can be used wherever other template tags are allowed.
 
+## Nested sub-expressions
+
+Sometimes an argument to a helper call is best expressed as a return value of
+some other expression. For this and other cases, one can use parentheses to
+express the evaluation order of nested expressions.
+
+```handlebars
+{{capitalize (getSummary post)}}
+```
+
+In this example, the result of the `getSummary` helper call will be passed to
+the `capitalize` helper.
+
+Sub-expressions can be used to calculate key-word arguments, too:
+
+```handlebars
+{{> tmpl arg=(helper post)}}
+```
+
 ## HTML Dialect
 
 Spacebars templates are written in [standard