@@ -99,8 +99,8 @@ create strings by simply writing some text in quotes.
 >>> 
 ```
 
-String's can also be written using "double quotes" instead of 'single quotes'.
-This is useful when the string needs to contain single quotes.
+Strings can also be written with "double quotes" instead of 'single
+quotes'. This is useful when we need to put quotes inside the string.
 
 ```python
 >>> "hello there"
@@ -183,6 +183,15 @@ and `)` also work the same way.
 >>>
 ```
 
+You can also leave out spaces to show what's calculated first. Python
+ignores it, but our code will be easier to read for people.
+
+```python
+>>> 1 + 2*3         # now it looks like 2*3 is calculated first
+7
+>>>
+```
+
 Python also supports many other kinds of calculations, but most of the
 time you don't need them. Actually you don't need even these
 calculations most of the time, but these calculations are probably