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diff --git a/readme.md b/readme.md
index 95b693a..a32a8a1 100644
--- a/readme.md
+++ b/readme.md
@@ -14,3 +14,10 @@ H.264.
 - `vgcodec` approximates images by drawing circles (on the GPU).
 - (`dhwt-codec` tries to compress using a discrete haar wavelet across all three
   dimensions. that doesnt work well)
+
+## the test framework
+
+| Variable   | Description  |
+| ---------- | ------------ |
+| `V_WIDTH`  | Video width  |
+| `V_HEIGHT` | Video height |