1 files changed, 2 insertions, 0 deletions
diff --git a/rng.h b/rng.h
index e843bbd..9ce2abd 100644
--- a/rng.h
+++ b/rng.h
@@ -18,8 +18,10 @@ class KeyRng : public Rng{
 	void stir();
 
 public:
+	//throws invalid_argument if keylen<=0
 	KeyRng(const char *key,int keylen);
 	explicit KeyRng(const std::string &key);
+
 	KeyRng(const Rng&)=delete; //just keep it at one KeyRng please
 	~KeyRng();