Update README.md

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@@ -144,7 +144,7 @@ If you want to use a build not available via these channels, reach out to discus
 * 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
+    * Station name: non null UTF-8 string of min length 1 character and max length 100 bytes (i.e. this could be 100 one-byte characters, or 50 two-byte characters, etc.)
     * Temperature value: non null double between -99.9 (inclusive) and 99.9 (inclusive), always with one fractional digit
 * There is a maximum of 10,000 unique station names
 * 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