diff --git a/engine/README.md b/engine/README.md
new file mode 100644
index 0000000..083e0e0
--- /dev/null
+++ b/engine/README.md
@@ -0,0 +1,13 @@
+## Engine
+
+This engines has a couple of actions that enable you to control the orbital camera.
+Here you will find all the controls and a couple of guides.
+
+For proper usage, run the program in the engine directory.
+
+### Controlos
+
+**A** - Enables/Disables the axis of the projection
+**R** - Resets the camera to the default position
+**O/I** - Zoom in/Zoom out
+**UP DOWN LEFT RIGHT** - Controls the camera movement
\ No newline at end of file
diff --git a/engine/src/main.cpp b/engine/src/main.cpp
index 0e34a7f..a2a3492 100644
--- a/engine/src/main.cpp
+++ b/engine/src/main.cpp
@@ -116,11 +116,15 @@ void processNormalKeys(unsigned char key, int x, int y) {
       cameraAngleY = 0;
       zoom = 1.0f;
       break;
-    case 'i':
-      zoom -= 0.1;
-      break;
     case 'o':
-      zoom += 0.1;
+      if(zoom > 0.2) {
+        zoom -= 0.1;
+      }
+      break;
+    case 'i':
+      if(zoom < 2.5) {
+        zoom += 0.1;
+      }
       break;
     default:
       break;