README.md

@@ -73,7 +73,7 @@ Build steps:
 	- set prefix for mingw e.g.: for C:\mingw\8_1_x32\ or C:\mingw\8_1_x64\
 	  set `SDK_MINGW_DIR=C:\mingw\8_1_x`
 	- set prefix for Qt5 e.g.: for C:\qt\qt5150_win32\ or C:\qt\qt5150_win64\
-	  set `K_QT5_DIR=C:\qt\qt5150_win`
+	  set `SDK_QT5_DIR=C:\qt\qt5150_win`
 	- set path to cmake directory
 	  set `SDK_CMAKE_DIR=C:\cmake` or `C:\Program Files\CMake`
 5. Run `make_shstk32.bat` or `make_shstk64.bat`