diff --git a/Makefile b/Makefile
index 516e133..ba28834 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 
 CWD=$(CURDIR)
-PATH_BUILD=${CWD}/build
+PATH_BUILD=./build
 PATH_TOOLS=${CWD}/tools
 PATH_COMBINE_OUTPUT=${PATH_BUILD}/ease.js
 PATH_COMBINE_OUTPUT_FULL=${PATH_BUILD}/ease-full.js
@@ -10,15 +10,18 @@ PATH_PERF_TEST=${PATH_TEST}/perf
 
 PERF_TESTS := $(shell find "$(PATH_PERF_TEST)" -name 'perf-*.js')
 
-PATH_DOC=${CWD}/doc
+PATH_DOC=./doc
 PATH_DOC_OUTPUT=${PATH_BUILD}/doc
 PATH_DOC_OUTPUT_INFO=${PATH_DOC_OUTPUT}/manual.info
 PATH_DOC_OUTPUT_PLAIN=${PATH_DOC_OUTPUT}/manual.txt
 PATH_DOC_OUTPUT_HTML=${PATH_DOC_OUTPUT}/manual
 PATH_DOC_OUTPUT_HTML1=${PATH_DOC_OUTPUT}/manual.html
 PATH_DOC_CSS=${PATH_DOC}/manual.css
+PATH_DOC_IMG=${PATH_DOC}/img
 PATH_MANUAL_TEXI=${PATH_DOC}/manual.texi
 
+doc_imgs := $(patsubst %.dia, %.png, $(wildcard $(PATH_DOC_IMG)/*.dia))
+
 COMBINE=${PATH_TOOLS}/combine
 
 TESTS := $(shell find "$(PATH_TEST)" \
@@ -36,7 +39,9 @@ all:     combine doc
 
 # create build dir
 mkbuild:
-	mkdir -p "${PATH_BUILD}"
+	mkdir -p "$(PATH_BUILD)"
+mkbuild-doc:
+	mkdir -p "$(PATH_DOC_OUTPUT)"
 
 # combine all modules into easily redistributable ease.js file (intended for
 # browser)
@@ -62,26 +67,41 @@ perf-%.js: default
 # files that were generated
 #
 # generates: pdf, HTML (multiple pages), HTML (single page)
-doc: mkbuild doc-pdf doc-texi doc-plain doc-html
-doc-pdf:
-	pdftex -output-directory "${PATH_DOC}" "${PATH_MANUAL_TEXI}"
-	pdftex -output-directory "${PATH_DOC}" "${PATH_MANUAL_TEXI}"
+doc: doc-pdf doc-texi doc-plain doc-html
+
+doc-img: $(doc_imgs)
+
+doc/img/%.png: doc/img/%.dia
+	dia -e $@ -s 600x $<
+
+doc-pdf: | mkbuild-doc doc-img
+	TEXINPUTS="$(PATH_DOC):" \
+		pdftex -output-directory "${PATH_DOC}" "${PATH_MANUAL_TEXI}" && \
+		TEXINPUTS="$(PATH_DOC):" \
+		pdftex -output-directory "${PATH_DOC}" "${PATH_MANUAL_TEXI}"
 	mv -f "${PATH_DOC}"/*.pdf "${PATH_DOC_OUTPUT}"
 	cd "$(PATH_DOC)" && rm -f $(shell cat "$(PATH_DOC)/.gitignore")
-doc-texi:
-	cd "${PATH_DOC}" && \
-		makeinfo -o "${PATH_DOC_OUTPUT_INFO}" "${PATH_MANUAL_TEXI}";
-doc-plain:
-	cd "${PATH_DOC}" && \
-		makeinfo --plain "${PATH_MANUAL_TEXI}" > "${PATH_DOC_OUTPUT_PLAIN}";
-doc-html:
-	cd "${PATH_DOC}" && \
-		makeinfo --html --css-include="${PATH_DOC_CSS}" \
-			-o "${PATH_DOC_OUTPUT_HTML}" "${PATH_MANUAL_TEXI}"; \
-		makeinfo --no-split --html --css-include="${PATH_DOC_CSS}" \
-			-o "${PATH_DOC_OUTPUT_HTML1}" "${PATH_MANUAL_TEXI}";
+
+doc-texi: | mkbuild-doc
+	makeinfo -I "$(PATH_DOC)" -o "${PATH_DOC_OUTPUT_INFO}" \
+		"${PATH_MANUAL_TEXI}";
+
+doc-plain: | mkbuild-doc
+	makeinfo --plain -I "$(PATH_DOC)" "${PATH_MANUAL_TEXI}" \
+		> "${PATH_DOC_OUTPUT_PLAIN}";
+
+doc-html: | mkbuild-doc doc-img
+	makeinfo --html --css-include="${PATH_DOC_CSS}" \
+		-I "$(PATH_DOC)" -o "${PATH_DOC_OUTPUT_HTML}" "${PATH_MANUAL_TEXI}"; \
+	makeinfo --no-split --html --css-include="${PATH_DOC_CSS}" \
+		-I "$(PATH_DOC)" -o "${PATH_DOC_OUTPUT_HTML1}" "${PATH_MANUAL_TEXI}";
+	mkdir -p "$(PATH_DOC_OUTPUT_HTML)/img"
+	cp "$(PATH_DOC_IMG)"/*.png "$(PATH_DOC_OUTPUT_HTML)/img"
+	ln -s manual/img "$(PATH_DOC_OUTPUT)/img"
+
 
 # clean up build dir
 clean:
 	rm -rf "${PATH_BUILD}"
+	rm -rf $(PATH_DOC_IMG)/*.png
 
diff --git a/doc/classes.texi b/doc/classes.texi
index b1cc923..ecbdd5a 100644
--- a/doc/classes.texi
+++ b/doc/classes.texi
@@ -70,6 +70,7 @@ ease.js, until such a point where prototypes are no longer adequate.
 
 @menu
 * Declaring Classes::  Learn how to declare a class with ease.js
+* Inheritance::        Extending classes from another
 * Member Visibility::  Encapsulation is a core concept of Object-Oriented
                        programming
 @end menu
@@ -291,6 +292,25 @@ declare static methods so that they may be accessed without the overhead of
 creating a new class instance.
 
 
+@node Inheritance
+@section Inheritance
+Inheritance is a touchy subject. It can be a powerful feature, but it can also
+be easily abused. @dfn{Inheritance} is the term used to describe the process of
+creating a @dfn{child} class that @dfn{extends} (inherits members from) another
+@dfn{parent} class. The parent class is also referred to as the @dfn{supertype}
+and the child is called the @dfn{subtype}. Let's consider the following example,
+where we have a dog, lazy dog, and a dog that walks on two legs:
+
+@float Figure, f:inheritance-ex
+@image{img/inheritance-ex,,,,png}
+@caption{Basic inheritance example}
+@end float
+
+In the above example, we would say that @var{LazyDog} and @var{TwoLeggedDog}
+are @emph{subtypes} of @var{Dog}, and that @var{Dog} is the @emph{supertype}
+of the other two.
+
+
 @node Member Visibility
 @section Member Visibility
 One of the major hurdles ease.js aimed to address (indeed, one of the core
diff --git a/doc/img/inheritance-ex.dia b/doc/img/inheritance-ex.dia
new file mode 100644
index 0000000..096285b
Binary files /dev/null and b/doc/img/inheritance-ex.dia differ
diff --git a/doc/img/inheritance-ex.png b/doc/img/inheritance-ex.png
new file mode 100644
index 0000000..1631bc1
Binary files /dev/null and b/doc/img/inheritance-ex.png differ
diff --git a/doc/manual.texi b/doc/manual.texi
index 6b3bb69..bbf9b81 100644
--- a/doc/manual.texi
+++ b/doc/manual.texi
@@ -52,10 +52,10 @@ Free Documentation License".
 @insertcopying
 @end ifnottex
 
-@include ./about.texi
-@include ./integration.texi
-@include ./classes.texi
-@include ./source-tree.texi
-@include ./license.texi
+@include about.texi
+@include integration.texi
+@include classes.texi
+@include source-tree.texi
+@include license.texi
 
 @bye