diff --git a/text/blk-counting.md b/text/blk-counting.md
index 6743be3..e25fa5f 100644
--- a/text/blk-counting.md
+++ b/text/blk-counting.md
@@ -41,7 +41,7 @@ macro_rules! count_tts {
 # }
 ```
 
-> **Note**: As of `rustc` 1.2, the compiler has *grevious* performance problems when large numbers of integer literals of unknown type must undergo inference.  We are using explicitly `usize`-typed literals here to avoid that.
+> **Note**: As of `rustc` 1.2, the compiler has *grievous* performance problems when large numbers of integer literals of unknown type must undergo inference.  We are using explicitly `usize`-typed literals here to avoid that.
 >
 > If this is not suitable (such as when the type must be substitutable), you can help matters by using `as` (*e.g.* `0 as $ty`, `1 as $ty`, *etc.*).