1 files changed, 5 insertions, 0 deletions
diff --git a/README.EXT b/README.EXT
index 509bffb..b41e6a4 100644
--- a/README.EXT
+++ b/README.EXT
@@ -189,6 +189,11 @@ listed below:
 
     Appends len bytes of data from ptr to the Ruby string.
 
+  rb_sprintf(const char *format, ...)
+  rb_vsprintf(const char *format, ...)
+
+    Creates a new Ruby string with printf(3) format.
+
  Array functions
 
   rb_ary_new()