Mention the reducer tool and location in the README. (#2341)
* Mention the reducer tool and location in the README.
* Remark on how to get info on specifying interestingness.
diff --git a/README.md b/README.md
index c8e1cb6..52c382e 100644
--- a/README.md
+++ b/README.md
@@ -432,6 +432,18 @@
* `spirv-val` - the standalone validator
* `<spirv-dir>/tools/val`
+### Reducer tool
+
+The reducer shrinks a SPIR-V binary module, guided by a user-supplied
+*interestingness test*.
+
+This is a work in progress, with initially only shrinks a module in a few ways.
+
+* `spirv-reduce` - the standalone reducer
+ * `<spirv-dir>/tools/reduce`
+
+Run `spirv-reduce --help` to see how to specify interestingness.
+
### Control flow dumper tool
The control flow dumper prints the control flow graph for a SPIR-V module as a
