diff --git a/docs/images/Makefile b/docs/images/Makefile
index c415f79..9416888 100644
--- a/docs/images/Makefile
+++ b/docs/images/Makefile
@@ -1,21 +1,20 @@
 PUMLs = $(wildcard *.puml)
 PDFs = $(patsubst %.puml,%.pdf,$(PUMLs))
 PNGs = $(patsubst %.puml,%.png,$(PUMLs))
 SVGs = $(patsubst %.puml,%.svg,$(PUMLs))
 
-all: $(PNGs) $(PDFs) $(SVGs)
+all: $(PNGs) $(SVGs)
 
 %.pdf: %.puml
 	plantuml -Tpdf $<
 
 %.png: %.puml
 	plantuml -Tpng $<
 
 %.svg: %.puml
 	plantuml -Tsvg $<
 
-
 .PHONY: clean
 
 clean:
 	rm -f $(PDFs) $(PNGs) $(SVGs)