diff --git a/include/grpc/support/tls.h b/include/grpc/support/tls.h
index 1077fdec295f70003ebe27bbf80e8ef9eb42240b..8dffd5225597de511ba7a082d49b661793faa4a4 100644
--- a/include/grpc/support/tls.h
+++ b/include/grpc/support/tls.h
@@ -44,7 +44,7 @@
    Thread locals have type gpr_intptr.
 
    Declaring a thread local variable 'foo':
-     GPR_TLS_DECL(foo, initial_value);
+     GPR_TLS_DECL(foo);
    Thread locals always have static scope.
 
    Initializing a thread local (must be done at library initialization