diff --git a/Makefile.am b/Makefile.am
index 97ff0fd..e19776d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -241,7 +241,7 @@
 
 # Install HTML files
 pkgdocdir = $(DOCUMENTATION_PATH)
-DOCDIRS = images www www/api www/source www/api/MagickCore www/api/MagickWand www/Magick++
+DOCDIRS = images images/patterns www www/api www/source www/api/MagickCore www/api/MagickWand www/Magick++
 HTML_INSTALL_DATA_TARGETS = install-data-html
 install-data-html:
 	$(mkinstalldirs) $(DESTDIR)$(pkgdocdir)