extend info to float related constants

diff --git a/UPGRADING b/UPGRADING
index 49428f07e0b2aa3334f5c1214a06ee827a7fdfff..ada82c886d07ebcc8a189366122777b0e96f4267 100644 (file)
--- a/UPGRADING
+++ b/UPGRADING
@@ -123,10 +123,12 @@ PHP 7.2 UPGRADE NOTES
 ========================================
 
 - Core:
-  . PHP_FLOAT_DIG
-  . PHP_FLOAT_EPSILON
-  . PHP_FLOAT_MIN
-  . PHP_FLOAT_MAX
+  . PHP_FLOAT_DIG     number of decimal digits, that can be rounded into a
+                      float and back without precision loss
+  . PHP_FLOAT_EPSILON smallest representable positive number x, so then
+                      x + 1.0 != 1.0
+  . PHP_FLOAT_MIN     max representable float number
+  . PHP_FLOAT_MAX     min representable float number
 
 - GD:
   . IMG_EFFECT_MULTIPLY