Documented ~> version specifier (crystal-lang#146)

* Documented `~>` version specifier Reused the explanation from http://bundler.io/v1.5/gemfile.html
f-fr · Jan 16, 2017 · a2743f1 · a2743f1
1 parent 3e7afcd
commit a2743f1
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/SPEC.md b/SPEC.md
@@ -146,6 +146,11 @@ A version requirement (String).
 
 Examples: `1.2.3`, `>= 1.0.0` or `~> 2.0`.
 
+Most of the version operators, like `>= 1.0.0`, are self-explanatory, but
+the `~>` operator has a special meaning, best shown by example:
+- `~> 2.0.3` is identical to `>= 2.0.3 and < 2.1`;
+- `~> 2.1` is identical to `>= 2.1 and < 3.0`.
+
 #### path
 
 A local path (String).