diff --git a/context.go b/context.go
index c542a67..93c000c 100644
--- a/context.go
+++ b/context.go
@@ -141,6 +141,11 @@ func (c *Context) NumFlags() int {
 	return c.flagSet.NFlag()
 }
 
+// Set sets a context flag to a value.
+func (c *Context) Set(name, value string) error {
+	return c.flagSet.Set(name, value)
+}
+
 // Determines if the flag was actually set
 func (c *Context) IsSet(name string) bool {
 	if c.setFlags == nil {
diff --git a/context_test.go b/context_test.go
index cbad304..20970b2 100644
--- a/context_test.go
+++ b/context_test.go
@@ -202,3 +202,12 @@ func TestContext_GlobalFlagsInSubcommands(t *testing.T) {
 	expect(t, subcommandRun, true)
 	expect(t, parentFlag, true)
 }
+
+func TestContext_Set(t *testing.T) {
+	set := flag.NewFlagSet("test", 0)
+	set.Int("int", 5, "an int")
+	c := NewContext(nil, set, nil)
+
+	c.Set("int", "1")
+	expect(t, c.Int("int"), 1)
+}