diff --git a/cmd/markdown/main.go b/cmd/markdown/main.go
index 6413090..22525ae 100644
--- a/cmd/markdown/main.go
+++ b/cmd/markdown/main.go
@@ -6,13 +6,9 @@ import (
 	"fmt"
 	"github.com/knieriem/markdown"
 	"io/ioutil"
-	"log"
 	"os"
-	"runtime/pprof"
 )
 
-var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
-
 func main() {
 	var b []byte
 
@@ -37,14 +33,8 @@ func main() {
 		Dlists: *optDlists,
 	}
 
-	if *cpuprofile != "" {
-		f, err := os.Create(*cpuprofile)
-		if err != nil {
-			log.Fatal(err)
-		}
-		pprof.StartCPUProfile(f)
-		defer pprof.StopCPUProfile()
-	}
+	startPProf()
+	defer stopPProf()
 
 	doc := markdown.Parse(string(b), e)
 	w := bufio.NewWriter(os.Stdout)
diff --git a/cmd/markdown/pprof.go b/cmd/markdown/pprof.go
new file mode 100644
index 0000000..be33388
--- /dev/null
+++ b/cmd/markdown/pprof.go
@@ -0,0 +1,35 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+	"runtime/pprof"
+)
+
+var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
+var memprofile = flag.String("memprofile", "", "write memory profile to file")
+
+func startPProf() {
+	if *cpuprofile != "" {
+		f, err := os.Create(*cpuprofile)
+		if err != nil {
+			log.Fatal(err)
+		}
+		pprof.StartCPUProfile(f)
+	}
+}
+
+func stopPProf() {
+	if *cpuprofile != "" {
+		pprof.StopCPUProfile()
+	}
+	if *memprofile != "" {
+		f, err := os.Create(*memprofile)
+		if err != nil {
+			log.Fatal(err)
+		}
+		pprof.WriteHeapProfile(f)
+		f.Close()
+	}
+}
diff --git a/misc/devel.mk b/misc/devel.mk
index 9264ed9..d86446a 100644
--- a/misc/devel.mk
+++ b/misc/devel.mk
@@ -27,8 +27,8 @@ benchmark: m ,,pmd ,,prevmd
 #
 pprof: cmd m
 	$(MD) -cpuprofile /tmp/md.prof <m > /tmp/,,md.out
-	@echo gopprof \'--nodefraction=0.1\' $(MD) /tmp/md.prof
-	@echo gopprof $(MD) /tmp/md.prof
+	@echo go tool pprof \'--nodefraction=0.1\' $(MD) /tmp/md.prof
+	@echo go tool pprof $(MD) /tmp/md.prof
 
 .PHONY:\
 	diff\