diff --git a/src/diff/graph.rs b/src/diff/graph.rs
index f697767b6c..7febe65894 100644
--- a/src/diff/graph.rs
+++ b/src/diff/graph.rs
@@ -90,7 +90,7 @@ enum EnteredDelimiter {
 
 use EnteredDelimiter::*;
 
-/// LSP is the stack top. One bit represents one `EnteredDelimiter`.
+/// LSB is the stack top. One bit represents one `EnteredDelimiter`.
 ///
 /// Assume the underlying type is u8, then
 ///