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-rw-r--r--Help/command/add_custom_command.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Help/command/add_custom_command.rst b/Help/command/add_custom_command.rst
index 9fbad4b..1307a58 100644
--- a/Help/command/add_custom_command.rst
+++ b/Help/command/add_custom_command.rst
@@ -130,7 +130,8 @@ The options are:
Specify the primary input source file to the command. This is
treated just like any value given to the ``DEPENDS`` option
but also suggests to Visual Studio generators where to hang
- the custom command.
+ the custom command. At most one custom command may specify a
+ given source file as its main dependency.
``OUTPUT``
Specify the output files the command is expected to produce.