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diff --git a/build/docs/mozbuild/dumbmake.rst b/build/docs/mozbuild/dumbmake.rst
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+dumbmake
+========
+
+*dumbmake* is a simple dependency tracker for make.
+
+It turns lists of make targets into longer lists of make targets that
+include dependencies.  For example:
+
+    netwerk, package
+
+might be turned into
+
+    netwerk, netwerk/build, toolkit/library, package
+
+The dependency list is read from the plain text file
+`topsrcdir/build/dumbmake-dependencies`.  The format best described by
+example:
+
+    build_this
+        when_this_changes
+
+Interpret this to mean that `build_this` is a dependency of
+`when_this_changes`.  More formally, a line (CHILD) indented more than
+the preceding line (PARENT) means that CHILD should trigger building
+PARENT.  That is, building CHILD will trigger building first CHILD and
+then PARENT.
+
+This structure is recursive:
+
+    build_this_when_either_change
+        build_this_only_when
+            this_changes
+
+This means that `build_this_when_either_change` is a dependency of
+`build_this_only_when` and `this_changes`, and `build_this_only_when`
+is a dependency of `this_changes`.  Building `this_changes` will build
+first `this_changes`, then `build_this_only_when`, and finally
+`build_this_when_either_change`.
diff --git a/build/docs/mozbuild/index.rst b/build/docs/mozbuild/index.rst
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+========
+mozbuild
+========
+
+mozbuild is a Python package providing functionality used by Mozilla's
+build system.
+
+Modules Overview
+================
+
+* mozbuild.backend -- Functionality for producing and interacting with build
+  backends. A build backend is an entity that consumes build system metadata
+  (from mozbuild.frontend) and does something useful with it (typically writing
+  out files that can be used by a build tool to build the tree).
+* mozbuild.compilation -- Functionality related to compiling. This
+  includes managing compiler warnings.
+* mozbuild.frontend -- Functionality for reading build frontend files
+  (what defines the build system) and converting them to data structures
+  which are fed into build backends to produce backend configurations.
+* mozpack -- Functionality related to packaging builds.
+
+Overview
+========
+
+The build system consists of frontend files that define what to do. They
+say things like "compile X" "copy Y."
+
+The mozbuild.frontend package contains code for reading these frontend
+files and converting them to static data structures. The set of produced
+static data structures for the tree constitute the current build
+configuration.
+
+There exist entities called build backends. From a high level, build
+backends consume the build configuration and do something with it. They
+typically produce tool-specific files such as make files which can be used
+to build the tree.
+
+Piecing it all together, we have frontend files that are parsed into data
+structures. These data structures are fed into a build backend. The output
+from build backends is used by builders to build the tree.
+