diff --git a/README.md b/README.md
index 3b2d64b..450f61a 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ tunnel.on('close', function() {
 
 ### opts
 
-* `subdomain` A *string* value requesting a specific subdomain on the proxy server. **Note** You may not actually receive this name depending on availablily.
+* `subdomain` A *string* value requesting a specific subdomain on the proxy server. **Note** You may not actually receive this name depending on availability.
 * `local_host` Proxy to this hostname instead of `localhost`. This will also cause the `Host` header to be re-written to this value in proxied requests.
 
 ### Tunnel