diff --git a/src/common/execio.h b/src/common/execio.h
--- a/src/common/execio.h
+++ b/src/common/execio.h
@@ -41,7 +41,11 @@ struct execio
   pid_t child;
 };
 
-/* nonzsero return on error */
+/*
+  runs progname with the arguments in argv. argv must be null terminated!!!!!!!!!
+
+  returns nonzsero return on error 
+*/
 int execio_open(struct execio **rem, const char *progname, char *const argv[]);
 
 /*