diff --git a/doc/Developers-Intro.md b/doc/Developers-Intro.md
index 31e055120f..329219925e 100644
--- a/doc/Developers-Intro.md
+++ b/doc/Developers-Intro.md
@@ -109,7 +109,7 @@ Here's the command to automatically fix the files you created/modified:
 
 	$> phpcbf --standard=ruleset.xml <file or directory>
 
-If the command-line tools `diff` and `patch` are unavailabe for you, `phpcbf` can use slightly slower PHP equivalents by using the `--no-patch` argument.
+If the command-line tools `diff` and `patch` are unavailable for you, `phpcbf` can use slightly slower PHP equivalents by using the `--no-patch` argument.
 
 ### Code documentation