diff --git a/book/Makefile b/book/Makefile
index a4c41c9..8e84021 100644
--- a/book/Makefile
+++ b/book/Makefile
@@ -7,6 +7,7 @@
 # You can set these variables from the command line, and also
 # from the environment for the first two.
 CODESPELL ?= codespell
+EPUBCHECK ?= epubcheck
 SPHINXOPTS    ?= -W
 SPHINXBUILD   ?= sphinx-build
 LYCHEE ?= lychee
@@ -14,6 +15,9 @@ PRINTF ?= printf
 SOURCEDIR     = source
 BUILDDIR      = build
 
+epub-check: clean epub
+	@$(EPUBCHECK) "$(BUILDDIR)/epub/"*.epub
+
 # Put it first so that "make" without argument is like "make help".
 help:
 	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)