diff --git a/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolConductor.scala b/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolConductor.scala
index 7a87a9899a..be4ccb15ca 100644
--- a/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolConductor.scala
+++ b/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolConductor.scala
@@ -44,22 +44,22 @@ private object PoolConductor {
   /*
     Stream Setup
     ============
-                                                                                                  Request-
-    Request-   +-----------+     +-----------+    Switch-    +-------------+     +-----------+    Context
-    Context    |   retry   |     |   slot-   |    Command    |   doubler   |     |   route   +-------------->
-    +--------->|   Merge   +---->| Selector  +-------------->| (MapConcat) +---->|  (Flexi   +-------------->
-               |           |     |           |               |             |     |   Route)  +-------------->
-               +----+------+     +-----+-----+               +-------------+     +-----------+       to slots
-                    ^                  ^
+                                                                                                  Request-
+    Request-   +-----------+     +-----------+    Switch-    +-------------+     +-----------+    Context
+    Context    |   retry   |     |   slot-   |    Command    |   doubler   |     |   route   +-------------->
+    +--------->|   Merge   +---->| Selector  +-------------->| (MapConcat) +---->|  (Flexi   +-------------->
+               |           |     |           |               |             |     |   Route)  +-------------->
+               +----+------+     +-----+-----+               +-------------+     +-----------+       to slots
+                    ^                  ^
                     |                  | SlotEvent
                     |             +----+----+
-                    |             | flatten | mapAsync
+                    |             | flatten | mapAsync
                     |             +----+----+
-                    |                  | RawSlotEvent
-                    | Request-         |
+                    |                  | RawSlotEvent
+                    | Request-         |
                     | Context     +---------+
-                    +-------------+  retry  |<-------- RawSlotEvent (from slotEventMerge)
-                                  |  Split  |
+                    +-------------+  retry  |<-------- RawSlotEvent (from slotEventMerge)
+                                  |  Split  |
                                   +---------+
 
   */
diff --git a/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolFlow.scala b/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolFlow.scala
index 457ff9b3aa..1bf95ebb42 100644
--- a/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolFlow.scala
+++ b/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolFlow.scala
@@ -26,28 +26,28 @@ private object PoolFlow {
   /*
     Pool Flow Stream Setup
     ======================
-                                               +-------------------+                             
-                                               |                   |                             
-                                        +----> | Connection Slot 1 +---->                        
-                                        |      |                   |    |                        
-                                        |      +---+---------------+    |                        
-                                        |          |                    |                        
-                       +-----------+    |      +-------------------+    |      +---------------+
-      RequestContext   |           +----+      |                   |    +----> |               |  ResponseContext
-    +----------------> | Conductor |---------> | Connection Slot 2 +---------> | responseMerge +------------------>
-                       |           +----+      |                   |    +----> |               |
-                       +-----------+    |      +---------+---------+    |      +---------------+
-                             ^          |          |     |              |                        
-                             |          |      +-------------------+    |                        
-                             |          |      |                   |    |                        
-                RawSlotEvent |          +----> | Connection Slot 3 +---->                        
-                             |                 |                   |                             
-                             |                 +---------------+---+                             
-                             |                     |     |     |                                    
-                       +-----------+  RawSlotEvent |     |     | 
-                       | slotEvent | <-------------+     |     |
-                       |   Merge   | <-------------------+     |                                  
-                       |           | <-------------------------+                                  
+                                               +-------------------+                             
+                                               |                   |                             
+                                        +----> | Connection Slot 1 +---->                        
+                                        |      |                   |    |                        
+                                        |      +---+---------------+    |                        
+                                        |          |                    |                        
+                       +-----------+    |      +-------------------+    |      +---------------+
+      RequestContext   |           +----+      |                   |    +----> |               |  ResponseContext
+    +----------------> | Conductor |---------> | Connection Slot 2 +---------> | responseMerge +------------------>
+                       |           +----+      |                   |    +----> |               |
+                       +-----------+    |      +---------+---------+    |      +---------------+
+                             ^          |          |     |              |                        
+                             |          |      +-------------------+    |                        
+                             |          |      |                   |    |                        
+                RawSlotEvent |          +----> | Connection Slot 3 +---->                        
+                             |                 |                   |                             
+                             |                 +---------------+---+                             
+                             |                     |     |     |                                    
+                       +-----------+  RawSlotEvent |     |     | 
+                       | slotEvent | <-------------+     |     |
+                       |   Merge   | <-------------------+     |                                  
+                       |           | <-------------------------+                                  
                        +-----------+
 
     Conductor:
diff --git a/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolSlot.scala b/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolSlot.scala
index b1b855d689..b712f17b6d 100644
--- a/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolSlot.scala
+++ b/akka-http-core/src/main/scala/akka/http/impl/engine/client/PoolSlot.scala
@@ -37,15 +37,15 @@ private object PoolSlot {
     Stream Setup
     ============
 
-    Request-   +-----------+              +-------------+              +-------------+     +------------+
-    Context    | Slot-     |  List[       |   flatten   |  Processor-  |   doubler   |     | SlotEvent- |  Response-
-    +--------->| Processor +------------->| (MapConcat) +------------->| (MapConcat) +---->| Split      +------------->
-               |           |  Processor-  |             |  Out         |             |     |            |  Context
-               +-----------+  Out]        +-------------+              +-------------+     +-----+------+
-                                                                                                 | RawSlotEvent
-                                                                                                 | (to Conductor
+    Request-   +-----------+              +-------------+              +-------------+     +------------+
+    Context    | Slot-     |  List[       |   flatten   |  Processor-  |   doubler   |     | SlotEvent- |  Response-
+    +--------->| Processor +------------->| (MapConcat) +------------->| (MapConcat) +---->| Split      +------------->
+               |           |  Processor-  |             |  Out         |             |     |            |  Context
+               +-----------+  Out]        +-------------+              +-------------+     +-----+------+
+                                                                                                 | RawSlotEvent
+                                                                                                 | (to Conductor
                                                                                                  |  via slotEventMerge)
-                                                                                                 v
+                                                                                                 v
    */
   def apply(slotIx: Int, connectionFlow: Flow[HttpRequest, HttpResponse, Any],
             settings: ConnectionPoolSettings)(implicit system: ActorSystem,