diff --git a/cache.go b/cache.go
index 720bebd..6cb8268 100644
--- a/cache.go
+++ b/cache.go
@@ -9,9 +9,9 @@ import (
 // This is probably only going to happen if it's nil.
 var ErrInvalidFetcher = errors.New("invalid fetcher")
 
-// ErrInvalidDuration is returned by Cache.SetExpiry if the duration is invalid.
+// ErrInvalidExpiry is returned by Cache.SetExpiry if the duration is invalid.
 // This is usually if it is <= 0.
-var ErrInvalidDuration = errors.New("invalid duration")
+var ErrInvalidExpiry = errors.New("invalid duration")
 
 type Fetcher[K comparable, V any] func(K) (V, error)
 
diff --git a/ezcache.go b/ezcache.go
index 667be56..24a9ea9 100644
--- a/ezcache.go
+++ b/ezcache.go
@@ -45,7 +45,7 @@ func (c *ezc[K, V]) SetFetcher(f Fetcher[K, V]) error {
 
 func (c *ezc[K, V]) SetExpiry(exp time.Duration) error {
 	if exp <= 0 {
-		return ErrInvalidDuration
+		return ErrInvalidExpiry
 	}
 	c.exp = exp
 	return nil