1 files changed, 4 insertions, 0 deletions

diff --git a/README.md b/README.md
index e503119..c34a19d 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,10 @@ From the sources tree
     php > var_dump(password_verify("secret", $hash));
     bool(true)
 
+## supported options
+
+* `cost` controls the CPU time cost of the hash. If `cost` is 0, a low default cost will be selected.
+
 # LICENSE
 
 Author: Remi Collet