Clarify tilde operator docs

doc/01-basic-usage.md

@@ -78,8 +78,10 @@ Version constraints can be specified in a few different ways.
   explained by example: `~1.2` is equivalent to `>=1.2,<2.0`, while `~1.2.3` is
   equivalent to `>=1.2.3,<1.3`. As you can see it is mostly useful for projects
   respecting semantic versioning. A common usage would be to mark the minimum
-  minor version you depend on, like `~1.2`, since in theory there should be no
-  backwards compatibility breaks until 2.0, that works well.
+  minor version you depend on, like `~1.2` (which allows anything up to, but not
+  including, 2.0). Since in theory there should be no backwards compatibility
+  breaks until 2.0, that works well. Another way of looking at it is that using
+  `~` specifies a minimum version, but allows the last digit specified to go up.
 
 By default only stable releases are taken into consideration. If you would like
 to also get RC, beta, alpha or dev versions of your dependencies you can do