Start SPIRV-Tools v2020.3
diff --git a/CHANGES b/CHANGES
index c47d4f1..fe6641e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,8 @@
 Revision history for SPIRV-Tools
 
+v2020.3-dev 2020-03-26
+ - Start v2020.3-dev
+
 v2020.2 2020-03-26
  - General:
    - Support extended instructions in the vscode language server