diff --git a/isidore.sh b/isidore.sh
index 249cd7e..125817f 100755
--- a/isidore.sh
+++ b/isidore.sh
@@ -16,6 +16,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+ISIDORE_VERSION="0.1.0"
 ISIDORE_CONFIG_DIR=""
 ISIDORE_CONFIG_DIR_OPTIONS=(
 	"$XDG_CONFIG_HOME/isidore"
@@ -75,6 +76,18 @@ function print_usage()
 	echo "USAGE: $1 <command> [options]"
 }
 
+##
+# Check to see if at the root of an Isidore project.
+##
+function check_in_project()
+{
+	if ! [ -f "./config.php" ] || ! [ -f "./.isidore-version" ]
+	then
+		echo "ERROR: You are not currently in the root of an Isidore project."
+		exit 1
+	fi
+}
+
 ##
 # Create a new project.
 #
@@ -94,6 +107,7 @@ function new_project()
 \$site_name = \"$NEW_PROJECT_NAME\";
 \$author = \"$ISIDORE_AUTHOR_NAME\";
 ?>" >> $NEW_PROJECT_DIR/config.php
+	echo "$ISIDORE_VERSION" > $NEW_PROJECT_DIR/.isidore-version
 }
 
 ##
@@ -101,8 +115,11 @@ function new_project()
 ##
 function clean_project()
 {
-	# TODO: Ensure that this is within an Isidore project.
-	rm -r output/
+	check_in_project
+	if [ -d "./output/" ]
+	then
+		rm -r ./output/
+	fi
 	echo "Project cleaned."
 }