Updated README

README.md

@@ -18,16 +18,18 @@ However, stickies will not be killed yet; you must now add some URLs to the **ma
 
 Open the AlwaysKillSticky options window (either by clicking on the AlwaysKillSticky icon in your toolbar, or by going to your Extensions page, clicking “Details”, then clicking “Extension options”).
 
-AlwaysKillSticky can work in either two modes: **blacklist mode** and **whitelist mode**.
+AlwaysKillSticky can work in either of two modes: **blacklist mode** and **whitelist mode**. (You can switch modes at any time.)
+
+### Blacklist mode
 
 In **blacklist mode** (the default), stickies will *only* be killed if:
 
 * the page URL matches one of the patterns in the **matching patterns** list, *and*;
 * the page does *not* match any of the patterns in the **exclusion patterns** list.
 
-Conversely, in **whitelist mode**, the matching patterns list is *ignored*. Stickies are *always* killed, *unless* the page matches one of the patterns in the exclusion patterns list.
+### Whitelist mode
 
-You can switch between blacklist mode and whitelist mode at any time.
+In **whitelist mode**, *the matching patterns list is ignored*. Stickies are *always* killed, *unless* the page matches one of the patterns in the **exclusion patterns** list.
 
 ## License