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-rw-r--r--Help/command/source_group.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Help/command/source_group.rst b/Help/command/source_group.rst
index a4b5bf1..83ae286 100644
--- a/Help/command/source_group.rst
+++ b/Help/command/source_group.rst
@@ -22,7 +22,8 @@ The options are:
CMake will automatically detect, from ``<src>`` files paths, source groups
it needs to create, to keep structure of source groups analogically to the
actual files and directories structure in the project. Paths of ``<src>``
- files will be cut to be relative to ``<root>``.
+ files will be cut to be relative to ``<root>``. The command fails if the
+ paths within ``src`` do not start with ``root``.
``PREFIX``
.. versionadded:: 3.8