diff --git a/README.md b/README.md
index 64cd480..7b49743 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ You will be provided with a set of **1705** images files named according to a st
 *   `output_scale` (float)
     * A scaling factor applied to the cropped image before it's returned. `1.0` means original size, `0.5` is 50% smaller.
     * Values range from `0 > scale >= 1.0`
+
 ### Canvas Visual Guide
 ```
      Origin (0,0)                                                       
@@ -78,7 +79,9 @@ y+ │         ├────────────────►▼ ┌─
              └─────────────────────────────────────────────────────────┘
 ```
 
-You can safely assume all parameters passed to this API are valid.
+### Implementation notes
+- You may assume all parameters passed to this API are always valid.
+- When converting from a floating point to integer (unit pixel), truncate it instead of rounding.
 
 ## 3. Evaluation Criteria