diff --git a/README.md b/README.md
index 4450d95..61937ab 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ Precompiled binaries are available for x86-64 Linux, macOS, and Windows.
 Use the `--help` argument for more details.
 
 ```bash
-minify-html --src /path/to/src.html --out /path/to/output.min.html
+minify-html --src /path/to/src.html --out /path/to/output.min.html --css --js
 ```
 
 ### API
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 04cb5ae..6d4a8c7 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 publish = false
 name = "minify-html-cli"
+description = "Extremely fast and smart HTML + JS + CSS minifier"
 version = "0.4.0"
 authors = ["Wilson Lin <code@wilsonl.in>"]
 edition = "2018"
diff --git a/cli/src/main.rs b/cli/src/main.rs
index 0ffbedf..a9d18b5 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -6,13 +6,18 @@ use structopt::StructOpt;
 use minify_html::{Cfg, FriendlyError, with_friendly_error};
 
 #[derive(StructOpt)]
+#[structopt(name = "minify-html", about = "Extremely fast and smart HTML + JS + CSS minifier")]
 struct Cli {
+    /// File to minify; omit for stdin.
     #[structopt(short, long, parse(from_os_str))]
     src: Option<std::path::PathBuf>,
+    /// Output destination; omit for stdout.
     #[structopt(short, long, parse(from_os_str))]
     out: Option<std::path::PathBuf>,
+    /// Enables JS minification.
     #[structopt(long)]
     js: bool,
+    /// Enables CSS minification.
     #[structopt(long)]
     css: bool,
 }
diff --git a/ruby/src/lib.rs b/ruby/src/lib.rs
index f1a88b2..915200b 100644
--- a/ruby/src/lib.rs
+++ b/ruby/src/lib.rs
@@ -15,14 +15,18 @@ methods! {
             .to_string()
             .into_bytes();
 
+        let cfg_hash = cfg_hash
+            .map_err(|e| VM::raise_ex(e) )
+            .unwrap();
+
         let cfg = &Cfg {
             minify_js: cfg_hash
-                .map(|h| h.at(&Symbol::new("minify_js")))
-                .and_then(|e| e.try_convert_to::<Boolean>())
+                .at(&Symbol::new("minify_js"))
+                .try_convert_to::<Boolean>()
                 .map_or(false, |v| v.to_bool()),
             minify_css: cfg_hash
-                .map(|h| h.at(&Symbol::new("minify_css")))
-                .and_then(|e| e.try_convert_to::<Boolean>())
+                .at(&Symbol::new("minify_css"))
+                .try_convert_to::<Boolean>()
                 .map_or(false, |v| v.to_bool()),
         };