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diff --git a/doc/mruby3.md b/doc/mruby3.md
index 29da25cbc..02884f51b 100644
--- a/doc/mruby3.md
+++ b/doc/mruby3.md
@@ -57,6 +57,17 @@ pull-request.
Some configuration macro names are changed for consistency
+== `MRB_NO_FLOAT`
+
+Changed from `MRB_WITHOUT_FLOAT` to conform `USE_XXX` naming
+convention.
+
+== `MRB_USE_FLOAT32`
+
+Changed from `MRB_USE_FLOAT` to make sure `float` here means
+using single precision float, and not the opposite of
+`MRB_NO_FLOAT`.
+
== `MRB_USE_METHOD_T_STRUCT`
Changed from `MRB_METHOD_T_STRUCT`.