Suggesting a change to a comment that puzzled me

While reading this, the comment made it difficult for me to simply absorb the concept.  It interrupted my reading flow, and I think this expresses the same meaning, but reads a bit better.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/doc/book/references-and-borrowing.md b/src/doc/book/references-and-borrowing.md
index 2ec3a00c0df..b9ccad06083 100644
--- a/src/doc/book/references-and-borrowing.md
+++ b/src/doc/book/references-and-borrowing.md
@@ -86,7 +86,7 @@ fn main() {
         return v.iter().fold(0, |a, &b| a + b);
     }
     // Borrow two vectors and sum them.
-    // This kind of borrowing does not allow mutation to the borrowed.
+    // This kind of borrowing does not allow mutation to the borrowed reference.
     fn foo(v1: &Vec<i32>, v2: &Vec<i32>) -> i32 {
         // do stuff with v1 and v2
         let s1 = sum_vec(v1);