diff --git a/contributing.md b/contributing.md
index 0b9ccd7..09a5fdd 100644
--- a/contributing.md
+++ b/contributing.md
@@ -3,9 +3,8 @@
 Testing Locally:
 
 ```shell
-asdf plugin test <plugin-name> <plugin-url> [--asdf-tool-version <version>] [--asdf-plugin-gitref <git-ref>] [test-command*]
+asdf plugin test micro https://github.com/sarg3nt/asdf-micro.git --asdf-tool-version 2.0.13 "micro --version"
 
-# TODO: adapt this
 asdf plugin test micro https://github.com/sarg3nt/asdf-micro.git "micro --version"
 ```
 
diff --git a/lib/utils.bash b/lib/utils.bash
index a4340c9..8fe207f 100644
--- a/lib/utils.bash
+++ b/lib/utils.bash
@@ -101,7 +101,7 @@ download_release() {
 	local version filename url
 	version="$1"
 	local -r platform=$(get_platform)
-	local -r extension=$(get_extension("$platform"))
+	local -r extension=$(get_extension "$platform")
 
 	#'https://github.com/zyedidia/micro/releases/download/v$version/micro-$version-$platform.$extension'
 	url="$GH_REPO/releases/download/v${version}/micro-${version}-${platform}.${extension}"