Update README.md

README.md

@@ -14,7 +14,7 @@ In order to be executable by a computer, the program has to be translated into m
 
 You can use the command 
 
-`g++ <source_code_file> -o <name_of_output_program> -std=c++11 -Wall -Werr`
+`g++ <source_code_file> -o <name_of_output_program> -std=c++11 -Wall -Werror`
 
 This tells the compiler (g++) where to find the source code and how to name the resulting program.
 In case you omit the name of the output program the result will most likely be an executable file called "a.out".