diff --git a/bootstrap b/bootstrap
index 6d4d08d51..8650c67a1 100755
--- a/bootstrap
+++ b/bootstrap
@@ -152,6 +152,7 @@ CMAKE_CXX_SOURCES="\
   cmTarget \
   cmTest \
   cmCustomCommand \
+  cmDocumentVariables \
   cmCacheManager \
   cmListFileCache \
   cmOrderLinkDirectories \