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-rw-r--r--docs/user-guide.md3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/user-guide.md b/docs/user-guide.md
index 1badc0c8..b1e123c2 100644
--- a/docs/user-guide.md
+++ b/docs/user-guide.md
@@ -59,6 +59,9 @@ The following tools are required to use the ARM Trusted Firmware:
wget http://releases.linaro.org/14.07/components/toolchain/binaries/gcc-linaro-aarch64-none-elf-4.9-2014.07_linux.tar.xz
tar -xf gcc-linaro-aarch64-none-elf-4.9-2014.07_linux.tar.xz
+* `libssl-dev` package to build the certificate generation tool when support
+ for Trusted Board Boot is needed.
+
* (Optional) For debugging, ARM [Development Studio 5 (DS-5)][DS-5] v5.20.