Add more detail about reserving tokens to the README.
diff --git a/README.md b/README.md
index 846b20d..beb1b7e 100644
--- a/README.md
+++ b/README.md
@@ -25,10 +25,18 @@
The SPIR-V XML registry file is updated by Khronos whenever a new enum range is allocated.
-Pull requests can be made to
+Pull requests can be made to
- request allocation of new enum ranges in the XML registry file
- reserve specific tokens in the JSON grammar
+### Reserving tokens in the JSON grammar
+
+Care should be taken to follow existing precedent in populating the details of reserved tokens. This includes:
+- pointing to what extension has more information, when possible
+- keeping enumerants in numeric order
+- when there are aliases, listing the preferred spelling first
+- adding the statement `"version" : "None"`
+
## How to install the headers
```
