diff --git a/prototype/corfurl/Makefile b/prototype/corfurl/Makefile
index 661cee2..2a0d365 100644
--- a/prototype/corfurl/Makefile
+++ b/prototype/corfurl/Makefile
@@ -14,8 +14,7 @@ deps:
 	$(REBAR_BIN) get-deps
 
 clean:
-	$(REBAR_BIN) clean
-	-for dir in deps/*; do (cd $$dir ; $(REBAR_BIN) clean); done
+	$(REBAR_BIN) -r clean
 
 test: deps compile eunit
 
diff --git a/prototype/tango/Makefile b/prototype/tango/Makefile
index 835e5d4..3beea58 100644
--- a/prototype/tango/Makefile
+++ b/prototype/tango/Makefile
@@ -14,9 +14,7 @@ deps:
 	$(REBAR_BIN) get-deps
 
 clean:
-	$(REBAR_BIN) clean
-	-for dir in deps/*; do (cd $$dir ; $(REBAR_BIN) clean); done
-
+	$(REBAR_BIN) -r clean
 
 test: deps compile eunit
 
diff --git a/prototype/tango/README.md b/prototype/tango/README.md
index 0bee4b6..ff2817f 100644
--- a/prototype/tango/README.md
+++ b/prototype/tango/README.md
@@ -67,6 +67,9 @@ research papers.
 
 ## TODO list
 
+__ The src/corfu* files in this sub-repo differ from the original
+   prototype source files in the ../corfu sub-repo, sorry!
+
 __ The current checkpoint implementation is fundamentally broken and
    needs a rewrite, or else.
    This issue is not mentioned at all in the Tango paper.