diff --git a/Makefile b/Makefile
index 2488165..3fca452 100644
--- a/Makefile
+++ b/Makefile
@@ -10,6 +10,14 @@
 KALAMAR_INSTANCE ?=
 KALAMAR_INSTANCE_DIR := $(abspath $(KALAMAR_INSTANCE))
 
+# Directory with Kalamar templates describing your own corpus, mounted into the
+# kalamar container. Put a doc/corpus.html.ep page there to replace Kalamar's
+# placeholder corpus page; KorAP-Docker's custom/README.md lists the available
+# templates and ships examples. The directory is created on demand.
+#   make korap KALAMAR_TEMPLATES=my-corpus-docs
+KALAMAR_TEMPLATES ?= custom
+KALAMAR_TEMPLATES_DIR := $(abspath $(KALAMAR_TEMPLATES))
+
 # Optional: override the kalamar container image (e.g. a locally built tag).
 # The instance's compose.instance.yaml already defaults to a renderer-capable
 # image; set this to test a specific build, e.g.
@@ -205,7 +213,8 @@
 	java -jar lib/Krill-Indexer.jar -c lib/krill.cfg --progress -i $(subst " ",;,$^) -o $@
 
 korap: check-src $(TARGET_DIR)/index
-	curl -s https://raw.githubusercontent.com/KorAP/KorAP-Docker/master/compose.yaml | sed 's/64543:64543/$(KORAP_PORT):64543/g' | COMPOSE_PROFILES='export,open,lite' INDEX='$(TARGET_DIR)/index' $(if $(KALAMAR_INSTANCE),KALAMAR_INSTANCE_DIR='$(KALAMAR_INSTANCE_DIR)') $(if $(KALAMAR_IMAGE),KALAMAR_IMAGE='$(KALAMAR_IMAGE)') docker compose -p korap -f - $(if $(KALAMAR_INSTANCE),-f '$(KALAMAR_INSTANCE_DIR)/compose.instance.yaml') up
+	mkdir -p '$(KALAMAR_TEMPLATES_DIR)'
+	curl -s https://raw.githubusercontent.com/KorAP/KorAP-Docker/master/compose.yaml | sed 's/64543:64543/$(KORAP_PORT):64543/g' | COMPOSE_PROFILES='export,open,lite' INDEX='$(TARGET_DIR)/index' KALAMAR_TEMPLATES='$(KALAMAR_TEMPLATES_DIR)' $(if $(KALAMAR_INSTANCE),KALAMAR_INSTANCE_DIR='$(KALAMAR_INSTANCE_DIR)') $(if $(KALAMAR_IMAGE),KALAMAR_IMAGE='$(KALAMAR_IMAGE)') docker compose -p korap -f - $(if $(KALAMAR_INSTANCE),-f '$(KALAMAR_INSTANCE_DIR)/compose.instance.yaml') up
 
 $(TARGET_DIR)/index.tar.xz: $(TARGET_DIR)/index
 	tar -I 'xz -T0' -C $(dir $<) -cf $@ $(notdir $<)