diff --git a/README.md b/README.md
index fa8b75a..45b96c0 100644
--- a/README.md
+++ b/README.md
@@ -137,6 +137,8 @@ npm install flexboxes
 - `.basis-12` 12/12 grid
 - `.basis-100vw`
 - `.basis-100vh`
+- `.basis-100vmax`
+- `.basis-100vmin`
 - `.basis-golden`
 - `.basis-content`
 - `.basis-auto`
diff --git a/main.css b/main.css
index e8dc872..5ee624f 100644
--- a/main.css
+++ b/main.css
@@ -107,6 +107,9 @@
 
 .basis-100vw { -ms-flex-preferred-size: 100vw; flex-basis: 100vw }
 .basis-100vh { -ms-flex-preferred-size: 100vh; flex-basis: 100vh }
+.basis-100vmax { -ms-flex-preferred-size: 100vmax; flex-basis: 100vmax }
+.basis-100vmin { -ms-flex-preferred-size: 100vmin; flex-basis: 100vmin }
+
 .basis-golden { -ms-flex-preferred-size: 61.803398875%; flex-basis: 61.803398875% }
 .basis-content { -ms-flex-preferred-size: content; flex-basis: content }
 .basis-auto { -ms-flex-preferred-size: auto; flex-basis: auto }
diff --git a/module.css b/module.css
index 723422a..729c5fe 100644
--- a/module.css
+++ b/module.css
@@ -107,6 +107,9 @@
 
 .basis-100vw { flex-basis: 100vw }
 .basis-100vh { flex-basis: 100vh }
+.basis-100vmax { flex-basis: 100vmax }
+.basis-100vmin { flex-basis: 100vmin }
+
 .basis-golden { flex-basis: 61.803398875% }
 .basis-content { flex-basis: content }
 .basis-auto { flex-basis: auto }