DOC: internal: filters: fix reference to entities.pdf

In doc/internals/api/filters.txt was the referece to
doc/internals/entities.pdf which was delteted in the
past.

diff --git a/doc/internals/api/filters.txt b/doc/internals/api/filters.txt
index eee74cf63067ec2ad3ffb471fd839d4f965fd63c..e48f2ba91cb84ab82b0e88990ecfd6e18768cc2b 100644 (file)
--- a/doc/internals/api/filters.txt
+++ b/doc/internals/api/filters.txt
@@ -47,7 +47,9 @@ SUMMARY
 First of all, to fully understand how filters work and how to create one, it is
 best to know, at least from a distance, what is a proxy (frontend/backend), a
 stream and a channel in HAProxy and how these entities are linked to each other.
-doc/internals/entities.pdf is a good overview.
+In doc/internals/api/layers.txt is a good overview of the different layers in
+HAProxy and in doc/internals/muxes.pdf is described the flow between the
+different muxes.
 
 Then, to support filters, many callbacks has been added to HAProxy at different
 places, mainly around channel analyzers. Their purpose is to allow filters to