diff --git a/README.md b/README.md
index e966e63..a8f7e8e 100644
--- a/README.md
+++ b/README.md
@@ -132,7 +132,7 @@ Blah...
 ```cpp
 // server_demo.cpp
 
-#include <unistd.h>					// sleep(), usleep().
+#include <unistd.h>                 // sleep(), usleep().
 #include <ctime>                    // time().
 #include <iostream>                 // std::cout, std::cerr, std::endl.
 #include <string>                   // std::string.
@@ -181,7 +181,7 @@ Blah...
 ```cpp
 // client_demo.cpp
 
-#include <unistd.h>					// sleep(), usleep().
+#include <unistd.h>                 // sleep(), usleep().
 #include <ctime>                    // time().
 #include <iostream>                 // std::cout, std::cerr, std::endl.
 #include <string>                   // std::string.