folly: fix make_optional compliation issue with gnu++17

[folly.git] / folly / docs / Overview.md

diff --git a/folly/docs/Overview.md b/folly/docs/Overview.md
index e65e12f1139c067667ddd7fe0ab9b2d2604d1ecb..9bd527ba896fdcd8e8e94d33f398c2999cfcb472 100644 (file)
--- a/folly/docs/Overview.md
+++ b/folly/docs/Overview.md
@@ -163,6 +163,11 @@ chain several queues together with processing steps in between.
 A highly specialized data structure consisting of a pointer, a 1-bit
 spin lock, and a 15-bit integral, all inside one 64-bit word.
 
+#### [`Poly.h`](Poly.md)
+
+A class template that makes it relatively easy to define a type-erasing
+polymorphic object wrapper.
+
 #### `Preprocessor.h`
 
 Necessarily evil stuff.