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-rw-r--r--docs/user-guide.rst6
1 files changed, 4 insertions, 2 deletions
diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index fe8ce5ff9..b9f08716a 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -1219,11 +1219,13 @@ command:
make PLAT=<platform> [DEBUG=1] [V=1] certtool
For platforms that require their own IDs in certificate files, the generic
-'cert_create' tool can be built with the following command:
+'cert_create' tool can be built with the following command. Note that the target
+platform must define its IDs within a ``platform_oid.h`` header file for the
+build to succeed.
::
- make USE_TBBR_DEFS=0 [DEBUG=1] [V=1] certtool
+ make PLAT=<platform> USE_TBBR_DEFS=0 [DEBUG=1] [V=1] certtool
``DEBUG=1`` builds the tool in debug mode. ``V=1`` makes the build process more
verbose. The following command should be used to obtain help about the tool: