diff --git a/README.cat b/README.cat
index 0b63c98ce..0c4b73e7f 100644
--- a/README.cat
+++ b/README.cat
@@ -21,4 +21,6 @@ What I've changed in the mod:
 
 - The speed limit is practically removed (set to the highest float possible)
 
-- The zipper powerup is VERY fast now, test it in the story mode level select level first.
+- The zipper powerup is VERY fast now, (x4) test it in the story mode level select level first.
+
+- You can customize the zipper speed (karts/kart_properties.cpp, look for the `#define ZIPPER_SPEED`)
diff --git a/src/karts/kart_properties.cpp b/src/karts/kart_properties.cpp
index 57190db4b..bafda1e88 100644
--- a/src/karts/kart_properties.cpp
+++ b/src/karts/kart_properties.cpp
@@ -52,6 +52,8 @@
 #include <ge_main.hpp>
 #endif
 
+#define ZIPPER_SPEED 4.0f
+
 float KartProperties::UNDEFINED = -99.9f;
 
 std::string KartProperties::getHandicapAsString(HandicapLevel h)
@@ -1013,13 +1015,13 @@ float KartProperties::getZipperDuration() const
 // ----------------------------------------------------------------------------
 float KartProperties::getZipperForce() const
 {
-    return m_cached_characteristic->getZipperForce() * 2.0f;
+    return m_cached_characteristic->getZipperForce() * ZIPPER_SPEED;
 }  // getZipperForce
 
 // ----------------------------------------------------------------------------
 float KartProperties::getZipperSpeedGain() const
 {
-    return m_cached_characteristic->getZipperSpeedGain() * 2.0f;
+    return m_cached_characteristic->getZipperSpeedGain() * ZIPPER_SPEED;
 }  // getZipperSpeedGain
 
 // ----------------------------------------------------------------------------