diff --git a/CMakeLists.txt b/CMakeLists.txt
index ad5a8384bfe..78834e3d485 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,7 @@ include(cmake/PCH.cmake)
 # Force out-of-source build
 string(COMPARE EQUAL "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}" BUILDING_IN_SOURCE)
 if(BUILDING_IN_SOURCE)
-    message(FATAL_ERROR "This project requires an out of source build. Please create a separate build directory and run 'cmake path_to_project [options]' there.")
+    message(FATAL_ERROR "This project requires an out of source build. Remove the file 'CMakeCache.txt' found in this directory before continuing, and create a separate build directory and run 'cmake path_to_project [options]' from there.")    
 endif(BUILDING_IN_SOURCE)
 
 # Select the Release build configuration by default.