diff --git a/book/src/08_futures/03_runtime.md b/book/src/08_futures/03_runtime.md
index ebae7da..17f528d 100644
--- a/book/src/08_futures/03_runtime.md
+++ b/book/src/08_futures/03_runtime.md
@@ -26,7 +26,7 @@ at any given time.
 
 ### Multithreaded runtime
 
-When using the multithreaded runtime, instead, there can up to `N` tasks running
+When using the multithreaded runtime, instead, there can be up to `N` tasks running
 _in parallel_ at any given time, where `N` is the number of threads used by the
 runtime. By default, `N` matches the number of available CPU cores.