diff --git a/README.md b/README.md
index d36ff53..8078212 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,6 @@
 
 ## Compatibility
 
-By default it targets macOS 10.7.
+Targets macOS 10.7 by default.
 
-To enable features added in macOS 10.8, set Cargo feature `mac_os_10_8_features`. To have both 10.8 features and 10.7 compatibility, also set `mac_os_10_7_support`. Setting both requires weak linkage, which is is a nighty-only feature as of Rust 1.19.
+To enable features added in macOS 10.8, set Cargo feature `mac_os_10_8_features`. To have both 10.8 features and 10.7 compatibility, also set `mac_os_10_7_support`. Setting both requires weak linkage, which is a nighty-only feature as of Rust 1.19.