diff --git a/logique-programmable/exercices/Makefile b/logique-programmable/exercices/Makefile
index 1b0e84f..ffc9f22 100644
--- a/logique-programmable/exercices/Makefile
+++ b/logique-programmable/exercices/Makefile
@@ -1,6 +1,6 @@
 timestamp=$(shell date +%Y-%m-%d_%H:%M)
 
-all: pre-requis ctd1
+all: pre-requis ctd1 ctd2 ctd3
 
 pre-requis: pre-requis.tex
 	@latexmk -pdf pre-requis.tex
@@ -29,5 +29,14 @@ ctd2: ctd2.tex
 		echo "Updated"; \
 	fi
 
+ctd3: ctd3.tex
+	@latexmk -pdf ctd3.tex
+	@if ! cmp --silent build/ctd3.pdf ctd3_*.pdf; then \
+		touch ctd3_tmp.pdf; \
+		rm ctd3*.pdf; \
+		cp build/ctd3.pdf ctd3_${timestamp}.pdf; \
+		echo "Updated"; \
+	fi
+
 clean:
 	@rm -rf build 2>/dev/null