Update README.md

Author: lemire

README.md

@@ -147,8 +147,11 @@ print the number 22250738585072012 three times:
 ## Behavior of result_out_of_range
 
 When parsing floating-point values, the numbers can sometimes be too small (e.g., `1e-1000`) or
-too large (e.g., `1e1000`). In such cases, it is customary to parse small values to zero and large
-values to infinity. That is the behaviour followed by the fast_float library.
+too large (e.g., `1e1000`). The C language established the precedent that these small values are out of range.
+In such cases, it is customary to parse small values to zero and large
+values to infinity. That is the behaviour of the C language (e.g., `stdtod`). That is the behaviour followed by the fast_float library.
+
+
 
 Specifically, we follow Jonathan Wakely's interpretation of the standard: