diff --git a/tools/mini_sigvis/README.md b/tools/mini_sigvis/README.md
index 3cc51604..27d4dd14 100644
--- a/tools/mini_sigvis/README.md
+++ b/tools/mini_sigvis/README.md
@@ -1,2 +1 @@
-This is a simple library for visualizing signals. You have a screen, which is made up of any number of channels. Each
-channel has a sample rate. The screen has an update rate.
\ No newline at end of file
+This is a simple library for visualizing signals. This readme will be updated later when the library stabilizes.
\ No newline at end of file
diff --git a/tools/mini_sigvis/mini_sigvis.h b/tools/mini_sigvis/mini_sigvis.h
index 8f2a2d7c..fd0b9cae 100644
--- a/tools/mini_sigvis/mini_sigvis.h
+++ b/tools/mini_sigvis/mini_sigvis.h
@@ -160,6 +160,9 @@ dtk_bool32 msigvis_window_event_handler(dtk_event* pEvent)
         {
             if (pEvent->mouseWheel.delta > 0) {
                 pScreen->zoomX = pScreen->zoomX * ( 2*pEvent->mouseWheel.delta);
+                if (pScreen->zoomX > 10000.0f) {
+                    pScreen->zoomX = 10000.0f;
+                }
             } else {
                 pScreen->zoomX = pScreen->zoomX / (-2*pEvent->mouseWheel.delta);
                 if (pScreen->zoomX < 0.000001f) {