add mention to default make option

README.md

@@ -36,6 +36,12 @@ https://github.com/wasabiz/picrin
 
 		$ make run
 
+- debug-run
+
+	By default make command runs REPL with all debug flags enabled.
+
+		$ make
+	
 In the default option, when `make` command is called without arguments, it builds the binary and right after that dropped into the picrin interactive shell (REPL).
 
 - install