diff --git a/Documentations/1-parser/Basics.md b/Documentations/1-parser/Basics.md
index 0e201319f3edde11725c975ad8886450ed6bf63b..6c270a5aec9cede2e05ef95954f4d71c25c9aa76 100644
--- a/Documentations/1-parser/Basics.md
+++ b/Documentations/1-parser/Basics.md
@@ -409,7 +409,7 @@ $ flex calc.l
 $ gcc lex.yy.c calc.tab.c driver.c -o calc
 $ ./calc
 1+1
- = 1.000000
+ = 2.000000
 2*(1+1)
  = 4.000000
 2*1+1