diff --git a/README.md b/README.md
new file mode 100644
index 0000000..003adeb
--- /dev/null
+++ b/README.md
@@ -0,0 +1,11 @@
+# Not Crystaldiskmark
+
+I wanted something to compare disks on Linux/Mac and enjoy
+CDM as a great generalized baseline. This uses fio to reproduce
+the same results in Linux. The simple curses library is included
+to produce a cleaner output, but is not required for use.
+
+```bash
+# Defaults to running in current directory if not specified
+ncdm.sh /mnt/bla
+```
diff --git a/ncdm.sh b/ncdm.sh
index d6e606d..eed2c65 100644
--- a/ncdm.sh
+++ b/ncdm.sh
@@ -8,7 +8,7 @@ command -v jq >/dev/null 2>&1 || { echo >&2 "Package 'jq' not installed. Abortin
 LOOPS=1 # How many times to run each test
 SIZE=1024m # File size
 
-if [ -z $1 ]; then
+if [ -z "$1" ]; then
     TARGET=$HOME
     echo "Defaulting to $TARGET for testing"
 else