diff --git a/src/control-flow-basics/blocks-and-scopes.md b/src/control-flow-basics/blocks-and-scopes.md
index 75007fb11196..3e8d685e0fbe 100644
--- a/src/control-flow-basics/blocks-and-scopes.md
+++ b/src/control-flow-basics/blocks-and-scopes.md
@@ -6,8 +6,9 @@ minutes: 10
 
 ## Blocks
 
-A block in Rust contains a sequence of expressions. Each block has a value and a
-type, which are those of the last expression of the block:
+A block in Rust contains a sequence of expressions, enclosed by braces `{}`.
+Each block has a value and a type, which are those of the last expression of the
+block:
 
 ```rust,editable
 fn main() {