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-rw-r--r--guides/source/active_support_core_extensions.md10
1 files changed, 9 insertions, 1 deletions
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md
index 67bed4c8da..b9f096b82a 100644
--- a/guides/source/active_support_core_extensions.md
+++ b/guides/source/active_support_core_extensions.md
@@ -1980,7 +1980,15 @@ and that symbol specifiers are also supported:
BigDecimal.new(5.00, 6).to_s(:db) # => "5.0"
```
-Engineering notation is still supported:
+Engineering notation is still supported.
+
+In Ruby 2.4:
+
+```ruby
+BigDecimal.new(5.00, 6).to_s("e") # => "0.5e1"
+```
+
+Whereas in Ruby 2.2 and 2.3:
```ruby
BigDecimal.new(5.00, 6).to_s("e") # => "0.5E1"