diff --git a/lcthw-remnants-2/Dockerfile b/lcthw-remnants-2/Dockerfile
index 14960d9..7e4b38c 100644
--- a/lcthw-remnants-2/Dockerfile
+++ b/lcthw-remnants-2/Dockerfile
@@ -3,4 +3,12 @@ FROM ubuntu:xenial
 ENV DEBIAN_FRONTEND noninteractive
 
 RUN apt-get update -yq
-RUN apt-get install -yq build-essential git man curl file sudo vim-tiny
+RUN apt-get install -yq \
+  build-essential \
+  curl \
+  file \
+  gdb \
+  git \
+  man \
+  sudo \
+  vim-tiny
diff --git a/lcthw-remnants-2/ex31.c b/lcthw-remnants-2/ex31.c
new file mode 100644
index 0000000..1b62ea5
--- /dev/null
+++ b/lcthw-remnants-2/ex31.c
@@ -0,0 +1,12 @@
+#include <unistd.h>
+
+int main(int argc, char *argv[])
+{
+  int i = 0;
+
+  while(i < 100) {
+    usleep(3000);
+  }
+
+  return 0;
+}