diff --git a/Makefile b/Makefile
index 0fe9b08..a9618f5 100644
--- a/Makefile
+++ b/Makefile
@@ -598,38 +598,38 @@
 FIP_BL2_ARGS := tb-fw
 endif
 
-$(if ${BL2}, $(eval $(call FIP_ADD_IMG,BL2,--${FIP_BL2_ARGS})),\
+$(if ${BL2}, $(eval $(call TOOL_ADD_IMG,BL2,--${FIP_BL2_ARGS})),\
 	$(eval $(call MAKE_BL,2,${FIP_BL2_ARGS})))
 endif
 
 ifeq (${NEED_SCP_BL2},yes)
-$(eval $(call FIP_ADD_IMG,SCP_BL2,--scp-fw))
+$(eval $(call TOOL_ADD_IMG,SCP_BL2,--scp-fw))
 endif
 
 ifeq (${NEED_BL31},yes)
 BL31_SOURCES += ${SPD_SOURCES}
-$(if ${BL31}, $(eval $(call FIP_ADD_IMG,BL31,--soc-fw)),\
+$(if ${BL31}, $(eval $(call TOOL_ADD_IMG,BL31,--soc-fw)),\
 	$(eval $(call MAKE_BL,31,soc-fw)))
 endif
 
 # If a BL32 image is needed but neither BL32 nor BL32_SOURCES is defined, the
-# build system will call FIP_ADD_IMG to print a warning message and abort the
+# build system will call TOOL_ADD_IMG to print a warning message and abort the
 # process. Note that the dependency on BL32 applies to the FIP only.
 ifeq (${NEED_BL32},yes)
 
 BUILD_BL32 := $(if $(BL32),,$(if $(BL32_SOURCES),1))
 
 $(if ${BUILD_BL32}, $(eval $(call MAKE_BL,32,tos-fw)),\
-	$(eval $(call FIP_ADD_IMG,BL32,--tos-fw)))
+	$(eval $(call TOOL_ADD_IMG,BL32,--tos-fw)))
 endif
 
 # Add the BL33 image if required by the platform
 ifeq (${NEED_BL33},yes)
-$(eval $(call FIP_ADD_IMG,BL33,--nt-fw))
+$(eval $(call TOOL_ADD_IMG,BL33,--nt-fw))
 endif
 
 ifeq (${NEED_BL2U},yes)
-$(if ${BL2U}, $(eval $(call FIP_ADD_IMG,BL2U,--ap-fwu-cfg,FWU_)),\
+$(if ${BL2U}, $(eval $(call TOOL_ADD_IMG,BL2U,--ap-fwu-cfg,FWU_)),\
 	$(eval $(call MAKE_BL,2u,ap-fwu-cfg,FWU_)))
 endif
 
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index 412f9cd..35dbb81 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -122,15 +122,15 @@
     $(4)CRT_ARGS += $(2) $(1)
 endef
 
-# FIP_ADD_IMG allows the platform to specify an image to be packed in the FIP
-# using a build option. It also adds a dependency on the image file, aborting
-# the build if the file does not exist.
+# TOOL_ADD_IMG allows the platform to specify an external image to be packed
+# in the FIP and/or for which certificate is generated. It also adds a
+# dependency on the image file, aborting the build if the file does not exist.
 #   $(1) = build option to specify the image filename (SCP_BL2, BL33, etc)
 #   $(2) = command line option for fiptool (--scp-fw, --nt-fw, etc)
 #   $(3) = FIP prefix (optional) (if FWU_, target is fwu_fip instead of fip)
 # Example:
-#   $(eval $(call FIP_ADD_IMG,BL33,--nt-fw))
-define FIP_ADD_IMG
+#   $(eval $(call TOOL_ADD_IMG,BL33,--nt-fw))
+define TOOL_ADD_IMG
     $(3)CRT_DEPS += check_$(1)
     $(3)FIP_DEPS += check_$(1)
     $(call TOOL_ADD_PAYLOAD,$(value $(1)),$(2),,$(3))
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index 09c87b5..33fa574 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -87,10 +87,10 @@
 # Add the build options to pack Trusted OS Extra1 and Trusted OS Extra2 images
 # in the FIP if the platform requires.
 ifneq ($(BL32_EXTRA1),)
-$(eval $(call FIP_ADD_IMG,BL32_EXTRA1,--tos-fw-extra1))
+$(eval $(call TOOL_ADD_IMG,BL32_EXTRA1,--tos-fw-extra1))
 endif
 ifneq ($(BL32_EXTRA2),)
-$(eval $(call FIP_ADD_IMG,BL32_EXTRA2,--tos-fw-extra2))
+$(eval $(call TOOL_ADD_IMG,BL32_EXTRA2,--tos-fw-extra2))
 endif
 
 # Enable PSCI_STAT_COUNT/RESIDENCY APIs on ARM platforms
@@ -211,7 +211,7 @@
     BL2_SOURCES		+=	${AUTH_SOURCES}					\
 				plat/common/tbbr/plat_tbbr.c
 
-    $(eval $(call FIP_ADD_IMG,NS_BL2U,--fwu,FWU_))
+    $(eval $(call TOOL_ADD_IMG,NS_BL2U,--fwu,FWU_))
 
     # We expect to locate the *.mk files under the directories specified below
 ifeq (${ARM_CRYPTOCELL_INTEG},0)
diff --git a/plat/arm/css/common/css_common.mk b/plat/arm/css/common/css_common.mk
index 4232a44..4f311c3 100644
--- a/plat/arm/css/common/css_common.mk
+++ b/plat/arm/css/common/css_common.mk
@@ -49,7 +49,7 @@
 ifeq (${CSS_LOAD_SCP_IMAGES},1)
   NEED_SCP_BL2 := yes
   ifneq (${TRUSTED_BOARD_BOOT},0)
-    $(eval $(call FIP_ADD_IMG,SCP_BL2U,--scp-fwu-cfg,FWU_))
+    $(eval $(call TOOL_ADD_IMG,SCP_BL2U,--scp-fwu-cfg,FWU_))
   endif
 
   ifeq (${CSS_USE_SCMI_SDS_DRIVER},1)
diff --git a/plat/hisilicon/hikey/platform.mk b/plat/hisilicon/hikey/platform.mk
index c8a2992..802c79c 100644
--- a/plat/hisilicon/hikey/platform.mk
+++ b/plat/hisilicon/hikey/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -36,10 +36,10 @@
 # Add the build options to pack Trusted OS Extra1 and Trusted OS Extra2 images
 # in the FIP if the platform requires.
 ifneq ($(BL32_EXTRA1),)
-$(eval $(call FIP_ADD_IMG,BL32_EXTRA1,--tos-fw-extra1))
+$(eval $(call TOOL_ADD_IMG,BL32_EXTRA1,--tos-fw-extra1))
 endif
 ifneq ($(BL32_EXTRA2),)
-$(eval $(call FIP_ADD_IMG,BL32_EXTRA2,--tos-fw-extra2))
+$(eval $(call TOOL_ADD_IMG,BL32_EXTRA2,--tos-fw-extra2))
 endif
 
 ENABLE_PLAT_COMPAT	:=	0
diff --git a/plat/hisilicon/hikey960/platform.mk b/plat/hisilicon/hikey960/platform.mk
index cb97deb..8d1876f 100644
--- a/plat/hisilicon/hikey960/platform.mk
+++ b/plat/hisilicon/hikey960/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -29,10 +29,10 @@
 # Add the build options to pack Trusted OS Extra1 and Trusted OS Extra2 images
 # in the FIP if the platform requires.
 ifneq ($(BL32_EXTRA1),)
-$(eval $(call FIP_ADD_IMG,BL32_EXTRA1,--tos-fw-extra1))
+$(eval $(call TOOL_ADD_IMG,BL32_EXTRA1,--tos-fw-extra1))
 endif
 ifneq ($(BL32_EXTRA2),)
-$(eval $(call FIP_ADD_IMG,BL32_EXTRA2,--tos-fw-extra2))
+$(eval $(call TOOL_ADD_IMG,BL32_EXTRA2,--tos-fw-extra2))
 endif
 
 ENABLE_PLAT_COMPAT	:=	0
diff --git a/plat/qemu/platform.mk b/plat/qemu/platform.mk
index 43ab846..a3ba878 100644
--- a/plat/qemu/platform.mk
+++ b/plat/qemu/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -133,10 +133,10 @@
 # Add the build options to pack Trusted OS Extra1 and Trusted OS Extra2 images
 # in the FIP if the platform requires.
 ifneq ($(BL32_EXTRA1),)
-$(eval $(call FIP_ADD_IMG,BL32_EXTRA1,--tos-fw-extra1))
+$(eval $(call TOOL_ADD_IMG,BL32_EXTRA1,--tos-fw-extra1))
 endif
 ifneq ($(BL32_EXTRA2),)
-$(eval $(call FIP_ADD_IMG,BL32_EXTRA2,--tos-fw-extra2))
+$(eval $(call TOOL_ADD_IMG,BL32_EXTRA2,--tos-fw-extra2))
 endif
 
 # Disable the PSCI platform compatibility layer