Readme updates

Author: FredShallcrass

README.md

@@ -29,7 +29,7 @@ We recommend using these fonts at 7 points and larger in print, 9 pixels and lar
 
 ### Available OpenType Features
 Outside of the default characters, there are a few extra features that are accessible in some applications, as well as via CSS:
-- **Raised Colon:** there is an option for a raised colon, either applied contextually between numbers or activated generally. The contextual option is available via ss11 (Stylistic Set #11), or use ss12 (Stylistic Set #12) or salt (Stylistic Alternates) for the global switch.
+- **Raised Colon:** there is an option for a raised colon, either applied contextually between numbers or activated generally. The contextual option is available via ss11 (Stylistic Set #11), or use ss12 (Stylistic Set #12) or salt (Stylistic Alternates) for the global switch. Also, the colon will automatically be raised in operators, to align with math symbols.
 - **Language Support:** ccmp and locl features ensure correct display across a wide range of languages. These are usually activated by default. We recommend setting the language tag/setting in your software to the desired language for best results.
 - **Superior/superscript and inferior/subscript figures** are included via their Unicode codepoints, or you can produce them from the default figures via the sups (Superscript), subs (Subscript), and si (Scientific Inferior) features.
 - **Fraction numerals** are similarly available via the numr (Numerator) and dnom (Denominator) features. A set of premade fractions is also available in the fonts.