diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index e9da0a879..ebc46d038 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -60,6 +60,7 @@ target_link_libraries(assignment_learning_ex dlib::dlib)
 # these commands from within the directory containing this CMakeLists.txt
 # file:
 #   mkdir build
+#   cd build
 #   cmake ..
 #   cmake --build . --config Release
 #