diff --git a/Help/command/add_custom_command.rst b/Help/command/add_custom_command.rst
index 9fbad4bf6..1307a58c5 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.
diff --git a/Help/command/add_custom_target.rst b/Help/command/add_custom_target.rst
index 996d08e7d..5134a70de 100644
--- a/Help/command/add_custom_target.rst
+++ b/Help/command/add_custom_target.rst
@@ -82,6 +82,9 @@ The options are:
   (``CMakeLists.txt`` file).  They will be brought up to date when
   the target is built.
 
+  Use the :command:`add_dependencies` command to add dependencies
+  on other targets.
+
 ``SOURCES``
   Specify additional source files to be included in the custom target.
   Specified source files will be added to IDE project files for