diff --git a/README.md b/README.md
index b50e829..365064d 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ cargo build --release
 cargo run --release
 ```
 ## Extensions and incompatibilities
-### Spported GNU extensions
+### Supported GNU extensions
 * Command-line arguments can be specified in long (`--`) form.
 * Spaces can precede a regular expression modifier.
 * `I` can be used in as a synonym for the `i` (case insensitive) substitution