diff --git a/Makefile b/Makefile
index e5ccacc..17a0f76 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,20 @@
 CC ?= gcc
 
 SOURCES := $(wildcard src/*.c)
+RELEASE ?= false
 
+CFLAGS ?= -Wall
+
+ifeq ($(RELEASE),true)
+	CFLAGS += -O3
+endif
 
 .PHONY: clean
 
 all: dist/msh
 
 dist/msh: $(SOURCES) dist
-	$(CC) -o $@ $(SOURCES)
+	$(CC) -o $@ $(SOURCES) $(CFLAGS)
 
 dist:
 	mkdir -p dist