diff --git a/README.md b/README.md
index 4775e35..cc97f91 100644
--- a/README.md
+++ b/README.md
@@ -464,15 +464,13 @@ top-level attributes: `fill`, `font`, `numFmt`, `alignment`, and `border`.
 |                 | diagonalDown   | `true||false`
 
 
-
-
-**COLOR_SPEC** Colors for `fill`, `font`, and `border` are specified as objects, either:
+**COLOR_SPEC**: Colors for `fill`, `font`, and `border` are specified as objects, either:
 * `{ auto: 1}` specifying automatic values
 * `{ rgb: "FFFFAA00" }` specifying a hex ARGB value
 * `{ theme: "1", tint: "-0.25"}` specifying an integer index to a theme color and a tint value (default 0)
 * `{ indexed: 64}` default value for `fill.bgColor`
 
-**BORDER_STYLE** is a string value which may take on one of the following values:
+**BORDER_STYLE**: Border style is a string value which may take on one of the following values:
  * `thin`
  * `medium`
  * `thick`
@@ -487,6 +485,14 @@ top-level attributes: `fill`, `font`, `numFmt`, `alignment`, and `border`.
  * `slantDashDot`
 
 
+Borders for merged areas are specified for each cell within the merged area.  So to apply a box border to a merged area of 3x3 cells, border styles would need to be specified for eight different cells:
+* left borders for the three cells on the left,
+* right borders for the cells on the right
+* top borders for the cells on the top
+* bottom borders for the cells on the left
+
+
+
 ## Tested Environments
 
  - NodeJS 0.8, 0.10 (latest release), 0.11 (unstable)