diff --git a/src/buffer/mod.rs b/src/buffer/mod.rs
index 6d8c2b0..5ff0183 100644
--- a/src/buffer/mod.rs
+++ b/src/buffer/mod.rs
@@ -143,8 +143,11 @@ impl Buffer {
         }
         // All other cases
         else {
-            // TODO
-            return;
+            // TODO: a more efficient implementation that directly
+            // manipulates the node tree.
+            let s = self.string_from_range(pos_a, pos_b);
+            self.remove_text(pos_a, pos_b);
+            self.insert_text(s.as_slice(), pos_to);
         }
     }