diff --git a/doc/combiner-explainer.md b/doc/combiner-explainer.md
index 9d0a4f30f2235fb96ba8051cc34e398070a32eff..9e9d077273ec0c2b15eb846e0bee2e188f08b5a8 100644
--- a/doc/combiner-explainer.md
+++ b/doc/combiner-explainer.md
@@ -92,7 +92,7 @@ class combiner {
 
 So that explains how combiners work in general. In gRPC, there is
 `start_batch(..., tag)` and then work only gets activated by somebody
-calling `cq::next` which returns a tag. This gives and API-level
+calling `cq::next` which returns a tag. This gives an API-level
 guarantee that there will be a thread doing polling to actually make
 work happen. However, some operations are not covered by a poller
 thread, such as cancellation that doesn't have a completion. Other
@@ -128,12 +128,12 @@ tries to spray events onto as many threads as possible to get as much concurrenc
 So `offload` really does:
 
 ``` 
-  distributor.run(continue_from_while_loop);
+  workqueue.run(continue_from_while_loop);
   break;
 ```
 
-This needs us to add another class variable for a `distributor`
-(called a `workqueue` in the code).
+This needs us to add another class variable for a `workqueue`
+(which is really conceptually a distributor).
 
 ```
 workqueue::run(f) {
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index b5021ede157f2f4f709fb50ee974e1f79378c524..5e6333dc8993b8d4aa5fb25bf80ba8fbb932146c 100644
--- a/tools/doxygen/Doxyfile.c++
+++ b/tools/doxygen/Doxyfile.c++
@@ -764,6 +764,7 @@ INPUT                  = doc/PROTOCOL-HTTP2.md \
 doc/PROTOCOL-WEB.md \
 doc/binary-logging.md \
 doc/c-style-guide.md \
+doc/combiner-explainer.md \
 doc/command_line_tool.md \
 doc/compression.md \
 doc/compression_cookbook.md \
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index 758ba2402ae0c2b1db74211b7aa724f8645ee75c..8b7ec50a9303df61a605b6ed1ea205d3ebeabef0 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -764,6 +764,7 @@ INPUT                  = doc/PROTOCOL-HTTP2.md \
 doc/PROTOCOL-WEB.md \
 doc/binary-logging.md \
 doc/c-style-guide.md \
+doc/combiner-explainer.md \
 doc/command_line_tool.md \
 doc/compression.md \
 doc/compression_cookbook.md \
diff --git a/tools/doxygen/Doxyfile.core b/tools/doxygen/Doxyfile.core
index cd3f2af44c838bd38cac384b7b33b36c8dd0ed9f..355029ec9e58b87906642aba66b9d15914f44a8f 100644
--- a/tools/doxygen/Doxyfile.core
+++ b/tools/doxygen/Doxyfile.core
@@ -764,6 +764,7 @@ INPUT                  = doc/PROTOCOL-HTTP2.md \
 doc/PROTOCOL-WEB.md \
 doc/binary-logging.md \
 doc/c-style-guide.md \
+doc/combiner-explainer.md \
 doc/command_line_tool.md \
 doc/compression.md \
 doc/compression_cookbook.md \
diff --git a/tools/doxygen/Doxyfile.core.internal b/tools/doxygen/Doxyfile.core.internal
index e4f56f23747ba0b6b1b1cd89e7488e88a7ffff1c..a3507274ec245c7e6268fda8111faf0dad9b8e27 100644
--- a/tools/doxygen/Doxyfile.core.internal
+++ b/tools/doxygen/Doxyfile.core.internal
@@ -764,6 +764,7 @@ INPUT                  = doc/PROTOCOL-HTTP2.md \
 doc/PROTOCOL-WEB.md \
 doc/binary-logging.md \
 doc/c-style-guide.md \
+doc/combiner-explainer.md \
 doc/command_line_tool.md \
 doc/compression.md \
 doc/compression_cookbook.md \