diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3bdc0e2..624e48f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,11 @@
 # 0.9.1
 
+This release is largely focused on `@extend`, but it also resolves some regressions resulting from the new parser.
+ - **Implement `@extend`**
+ - properly document new API
  - fix regression in which `@at-root` would panic when placed after a ruleset
  - fix regression related to `@mixin` and `@function` scoping when combined with outer, local variables
+ - remove most remaining `unwrap`s that could result in a panic
 
 # 0.9.0
 
diff --git a/Cargo.toml b/Cargo.toml
index 405c2ed..aa831b9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "grass"
 version = "0.9.0"
-description = "SASS compiler"
+description = "A near-feature-complete Sass compiler written purely in Rust"
 readme = "README.md"
 license = "MIT"
 categories = ["command-line-utilities", "web-programming"]
@@ -20,7 +20,7 @@ required-features = ["commandline"]
 [lib]
 name = "grass"
 path = "src/lib.rs"
-# crate-type = ["cdylib", "rlib"]
+crate-type = ["cdylib", "rlib"]
 bench = false
 
 [[bench]]
diff --git a/README.md b/README.md
index b90f390..64c58c1 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,13 @@
 # grass
 
-This crate aims to provide a high level interface for compiling SASS into
-plain CSS. It offers a very limited API, currently exposing only 2 structs.
+This crate aims to provide a high level interface for compiling Sass into
+plain CSS. It offers a very limited API, currently exposing only 2 functions.
 
 In addition to a library, also included is a binary that is intended to act as an invisible
-replacement to the sass commandline executable.
+replacement to the Sass commandline executable.
 
-This crate aims to achieve complete feature parity with the dart-sass reference
-implementation. A deviation from the dart-sass implementation can be considered
+This crate aims to achieve complete feature parity with the `dart-sass` reference
+implementation. A deviation from the `dart-sass` implementation can be considered
 a bug except for in the following situations:
 
 - Error messages
@@ -32,13 +32,11 @@ The large features remaining are
 
 ```
 builtin functions min, max
-@extend (~600 tests)
 indented syntax (27 tests)
 css imports
-@use and module system (~1200 tests)
-@forward (~400 tests)
+@use, @forward, and the module system (~1000 tests)
 @keyframes (~30 tests)
-@supports (~128 tests)
+@supports (~100 tests)
 ```
 
 ## Features
@@ -71,7 +69,14 @@ cargo b --release
 ./sass-spec/sass-spec.rb -c './target/release/grass'
 ```
 
-These numbers come from a default run of the sass specification as shown above.
+These numbers come from a default run of the Sass specification as shown above.
+
+```
+2020-06-20
+PASSING: 2750
+FAILING: 2343
+TOTAL: 5093
+```
 
 ```
 2020-06-16
diff --git a/src/atrule/kind.rs b/src/atrule/kind.rs
index 0d30411..11d64f7 100644
--- a/src/atrule/kind.rs
+++ b/src/atrule/kind.rs
@@ -6,7 +6,7 @@ use crate::error::SassError;
 
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub enum AtRuleKind {
-    // SASS specific @rules
+    // Sass specific @rules
     /// Loads mixins, functions, and variables from other Sass
     /// stylesheets, and combines CSS from multiple stylesheets together
     Use,
diff --git a/src/color/mod.rs b/src/color/mod.rs
index aa9a1ac..fbefd0e 100644
--- a/src/color/mod.rs
+++ b/src/color/mod.rs
@@ -1,6 +1,6 @@
 //! A color is internally represented as either RGBA or HSLA.
 //!
-//! Colors can be constructed in SASS through names (e.g. red, blue, aqua)
+//! Colors can be constructed in Sass through names (e.g. red, blue, aqua)
 //! or the builtin functions `rgb()`, `rgba()`, `hsl()`, and `hsla()`,
 //! all of which can accept 1-4 arguments.
 //!
diff --git a/src/error.rs b/src/error.rs
index 47b7f54..b05632c 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -120,6 +120,6 @@ impl From<(String, Span)> for SassError {
 impl Error for SassError {
     #[inline]
     fn description(&self) -> &'static str {
-        "SASS parsing error"
+        "Sass parsing error"
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 82076ff..bcc1b7d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,5 @@
 /*! # grass
-An implementation of the sass specification in pure rust.
-
-All functionality is currently exposed through [`StyleSheet`].
+An implementation of the Sass specification in pure rust.
 
 Spec progress as of 2020-05-01:
 
diff --git a/src/value/sass_function.rs b/src/value/sass_function.rs
index a60d821..1dfc87b 100644
--- a/src/value/sass_function.rs
+++ b/src/value/sass_function.rs
@@ -1,8 +1,8 @@
-//! SASS functions are those that are evaluated and return a value
+//! Sass functions are those that are evaluated and return a value
 //!
-//! SASS functions can be either user-defined or builtin.
+//! Sass functions can be either user-defined or builtin.
 //!
-//! User-defined functions are those that have been implemented in SASS
+//! User-defined functions are those that have been implemented in Sass
 //! using the @function rule. See the documentation of `crate::atrule::Function`
 //! for more information.
 //!
@@ -16,7 +16,7 @@ use crate::{
     parse::Parser, value::Value,
 };
 
-/// A SASS function
+/// A Sass function
 ///
 /// See toplevel documentation for more information
 ///