diff --git a/README.md b/README.md
index 24142a2..74e45a4 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,3 @@
 # Channel-noMOC-Darwin
 The Darwin package and configuration files for the MITgcm channel model without a northern sponge layer.
+The version of MITgcm is chkp63n.