diff --git a/Makefile b/Makefile
index 20f878fa..c4e161b0 100644
--- a/Makefile
+++ b/Makefile
@@ -124,5 +124,7 @@ genlinktests.clean:
 		printf "  TEST FAIL : $*\n";		\
 	fi;
 
+list-targets:
+	@echo $(TARGETS)
 
-.PHONY: build lib $(LIB_DIRS) doc clean generatedheaders cleanheaders stylecheck genlinktests genlinktests.clean
+.PHONY: build lib $(LIB_DIRS) doc clean generatedheaders cleanheaders stylecheck genlinktests genlinktests.clean list-targets
diff --git a/README.md b/README.md
index cbb5c9c3..8d86e7c0 100644
--- a/README.md
+++ b/README.md
@@ -103,6 +103,14 @@ For a more verbose build you can use
 
     $ make V=1
 
+You can reduce the build time by specifying a particular MCU series
+
+    $ make TARGETS='stm32/f1 stm32/f4'
+
+Supported targets can be listed using:
+
+    $ make list-targets
+
 Fine-tuning the build
 ---------------------