diff --git a/dynstring.h b/dynstring.h
index 8ac7e1dc..dfed7425 100644
--- a/dynstring.h
+++ b/dynstring.h
@@ -96,6 +96,10 @@ int DynStringBackspace(pDynString self);
    /* 
       removes one character at the end from the dynstring
     */
+int DynStringShorten(pDynString self, int length);
+   /* 
+      shorten the dynstring to the given length
+    */
 char *Dyn2Cstring(pDynString self);
    /* 
       convert to C string and delete dynstring. The result must be freed when no longer used.