Rule and value range clarifications

1 files changed, 5 insertions, 1 deletions

diff --git a/README.md b/README.md
index 22bdbc7..a6ef476 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # 1️⃣🐝🏎️ The One Billion Row Challenge
 
-_Status Jan 1: This challenge is open for submissions!_
+_Status Jan 1: This challenge is [open for submissions](https://www.morling.dev/blog/one-billion-row-challenge/)!_
 
 The One Billion Row Challenge (1BRC) is a fun exploration of how far modern Java can be pushed for aggregating one billion rows from a text file.
 Grab all your (virtual) threads, reach out to SIMD, optimize your GC, or pull any other trick, and create the fastest implementation for solving this task!
@@ -119,6 +119,10 @@ If you want to use a build not available via these channels, reach out to discus
 * Implementations must be provided as a single source file
 * The computation must happen at application _runtime_, i.e. you cannot process the measurements file at _build time_
 (for instance, when using GraalVM) and just bake the result into the binary
+* Input value ranges are as follows:
+    * Station name: non null UTF-8 string of min length 1 character and max length 100 characters
+    * Temperature value: non null double between -99.9 (inclusive) and 99.9 (inclusive), always with one fractional digit
+* Implementations must not rely on specifics of a given data set, e.g. any valid station name as per the constraints above and any data distribution (number of measurements per station) must be supported
 
 ## Entering the Challenge