diff --git a/NEWS.md b/NEWS.md
index 5606ef6..71dba32 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -37,7 +37,7 @@ tibble(subjid=c(1:10, 1)) %>% assert_no_duplicate() %>% nrow()
 
 #### Minor breaking changes
 
-- `read_trialmaster(use_cache=FALSE)` is now the default. Caching is not that useful after all so you should opt-in rather than opt-out.
+- `read_trialmaster(use_cache="write")` is now the default. Caching is not that useful after all so you should opt-in rather than opt-out.
 
 - `read_trialmaster(extend_lookup=TRUE)` is now the default.
 
diff --git a/R/trialmaster.R b/R/trialmaster.R
index de9ed72..7595924 100644
--- a/R/trialmaster.R
+++ b/R/trialmaster.R
@@ -18,8 +18,8 @@
 #' @importFrom glue glue
 #' @importFrom rlang check_dots_empty
 #' @importFrom stringr str_remove
-read_trialmaster = function(archive, ..., use_cache=FALSE, 
 #' @importFrom utils object.size
+read_trialmaster = function(archive, ..., use_cache="write", 
                             clean_names_fun=NULL,
                             split_mixed=FALSE,
                             extend_lookup=TRUE,