diff --git a/README.md b/README.md
index 5050b641..0c20ab1b 100644
--- a/README.md
+++ b/README.md
@@ -86,18 +86,12 @@ https://github.com/wasabiz/picrin
 
 ## How to use it
 
-- debug-run
-
-	By default make command runs REPL with all debug flags enabled (PIC_GC_STRESS, VM_DEBUG, DEBUG).
-
-		$ make
-	
 - build
 
-		$ make build
-
-	built executable binary will be under bin/ directory and shared library `libpicrin.so` under lib/.
+	A built executable binary will be under bin/ directory and a shared library `libpicrin.so` under lib/.
 	
+		$ make
+
 	If you want to build picrin on other systems than x86_64, make sure PIC_NAN_BOXING flag is turned off (see include/config.h for detail).
 
 - run
@@ -106,8 +100,12 @@ https://github.com/wasabiz/picrin
 
 		$ make run
 
-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).
+- debug-run
 
+	When `make` command is called with an argument `debug`, it builds the binary with all debug flags enabled (PIC_GC_STRESS, VM_DEBUG, DEBUG).
+
+		$ make debug
+	
 - install
 
 	As of now picrin does not provide a command automatically installs the binary. If you want to place picrin library and binary in a parmanent directory, please do it by hand.