diff --git a/book/Makefile b/book/Makefile
index cda2a70..15c0f8a 100644
--- a/book/Makefile
+++ b/book/Makefile
@@ -8,6 +8,7 @@
 # from the environment for the first two.
 SPHINXOPTS    ?=
 SPHINXBUILD   ?= sphinx-build
+LYCHEE ?= lychee
 SOURCEDIR     = source
 BUILDDIR      = build
 
@@ -15,6 +16,9 @@ BUILDDIR      = build
 help:
 	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
+html-linkcheck: html
+	@$(LYCHEE) "$(BUILDDIR)/html/"*.html
+
 .PHONY: help Makefile
 
 # Catch-all target: route all unknown targets to Sphinx using the new