diff --git a/Makefile b/Makefile
index 0021c04..0260f50 100644
--- a/Makefile
+++ b/Makefile
@@ -1,26 +1,26 @@
-SOURCES = $(shell find . -name "*.go" | grep -v testdocs_test.go)
-PREFIX ?= ~/bin
+sources = $(shell find . -name "*.go" | grep -v testdocs_test.go)
+prefix ?= ~/bin
 
 default: build
 
-libdocreflect: $(SOURCES)
+libdocreflect: $(sources)
 	go build .
 
-libgenerate: $(SOURCES)
+libgenerate: $(sources)
 	go build ./generate
 
 .bin:
 	mkdir -p .bin
 
-.bin/docreflect: $(SOURCES) .bin
+.bin/docreflect: $(sources) .bin
 	go build -o .bin/docreflect ./cmd/docreflect
 
 build: libdocreflect libgenerate .bin/docreflect
 
-testdocs_test.go: $(SOURCES) .bin/docreflect
+testdocs_test.go: $(sources) .bin/docreflect
 	.bin/docreflect generate docreflect_test code.squareroundforest.org/arpio/docreflect/internal/tests/src/testpackage > testdocs_test.go
 
-.cover: $(SOURCES) testdocs_test.go
+.cover: $(sources) testdocs_test.go
 	go test -count 1 -coverprofile .cover . ./generate
 
 check: .cover
@@ -31,11 +31,11 @@ cover: .cover
 showcover: .cover
 	go tool cover -html .cover
 
-fmt: $(SOURCES)
+fmt: $(sources)
 	go fmt . ./generate ./cmd/docreflect
 
 install: .bin/docreflect
-	cp .bin/docreflect $(PREFIX)
+	cp .bin/docreflect $(prefix)
 
 clean:
 	go clean ./...