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diff --git a/docs/porting-guide.md b/docs/porting-guide.md
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+++ b/docs/porting-guide.md
@@ -164,11 +164,12 @@ constants defined. In the ARM FVP port, this file is found in
* **#define : BL2_BASE**
Defines the base address in secure RAM where BL1 loads the BL2 binary image.
+ Must be aligned on a page-size boundary.
* **#define : BL31_BASE**
Defines the base address in secure RAM where BL2 loads the BL3-1 binary
- image.
+ image. Must be aligned on a page-size boundary.
### Other mandatory modifications