diff --git a/README b/README
index 49b1798..e7f5da5 100644
--- a/README
+++ b/README
@@ -30,3 +30,8 @@ now a macro.  Update a function prototype used in a VERBATIM block.
 20150219 With Michael Hines suggestion, parbush/kca.mod and
 parscalebush/kca.mod updated to a derivative block compatible with
 cnexp (restores original model epileptiform activity).
+
+Changelog
+---------
+2022-05: Updated MOD files to compile with the latest neuron releases where
+         ion variables used as STATE can not be declared as GLOBAL.
diff --git a/parbulbNet/cadecay.mod b/parbulbNet/cadecay.mod
index acafa7e..737f13b 100644
--- a/parbulbNet/cadecay.mod
+++ b/parbulbNet/cadecay.mod
@@ -9,7 +9,7 @@ NEURON{
 	SUFFIX cad
 	USEION ca READ ica, cai WRITE cai
 	RANGE ica, channel_flow, depth, B
-	GLOBAL cai, tau, cainf
+	GLOBAL tau, cainf
 }
 
 UNITS {