diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5df5866
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/doc
diff --git a/Makefile.in b/Makefile.in
index 0d014e7..d3933c6 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -7,6 +7,9 @@ AR ?= ar
 RUSTC ?= rustc
 RUSTFLAGS ?=
 EXT_DEPS ?=
+RUSTDOC ?= rustdoc
+RUSTDOC_FLAGS ?=
+RUSTDOC_TARGET ?= doc
 
 RUST_SRC=$(shell find $(VPATH)/. -type f -name '*.rs')
 
@@ -26,6 +29,12 @@ alert-test: alert.rc $(RUST_SRC) $(EXT_DEPS)
 check: alert-test
 	./alert-test
 
+.PHONY: doc
+doc: $(RUSTDOC_TARGET)/alert/index.html
+
+$(RUSTDOC_TARGET)/alert/index.html: alert.rc $(RUST_SRC) $(EXT_DEPS)
+	$(RUSTDOC) $(RUSTDOC_FLAGS) $< -o $(RUSTDOC_TARGET)
+
 .PHONY: clean
 clean:
 	rm -f *.o *.a *.so *.dylib *.rlib *.dll *.dummy *-test