diff --git a/collections.go b/collections.go
index c006799..319e01a 100644
--- a/collections.go
+++ b/collections.go
@@ -103,10 +103,14 @@ func (g *sliceGen[E, K]) value(t *T) []E {
 	return sl
 }
 
+// MapOf creates a map[K]V generator. MapOf(key, val) is equivalent to MapOfN(key, val, -1, -1).
 func MapOf[K comparable, V any](key *Generator[K], val *Generator[V]) *Generator[map[K]V] {
 	return MapOfN(key, val, -1, -1)
 }
 
+// MapOfN creates a map[K]V generator. If minLen >= 0, generated maps have minimum length of minLen.
+// If maxLen >= 0, generated maps have maximum length of maxLen. MapOfN panics if maxLen >= 0
+// and minLen > maxLen.
 func MapOfN[K comparable, V any](key *Generator[K], val *Generator[V], minLen int, maxLen int) *Generator[map[K]V] {
 	assertValidRange(minLen, maxLen)
 
@@ -118,10 +122,15 @@ func MapOfN[K comparable, V any](key *Generator[K], val *Generator[V], minLen in
 	})
 }
 
+// MapOfValues creates a map[K]V generator, where keys are generated by applying keyFn to values.
+// MapOfValues(val, keyFn) is equivalent to MapOfNValues(val, -1, -1, keyFn).
 func MapOfValues[K comparable, V any](val *Generator[V], keyFn func(V) K) *Generator[map[K]V] {
 	return MapOfNValues(val, -1, -1, keyFn)
 }
 
+// MapOfNValues creates a map[K]V generator, where keys are generated by applying keyFn to values.
+// If minLen >= 0, generated maps have minimum length of minLen. If maxLen >= 0, generated maps
+// have maximum length of maxLen. MapOfNValues panics if maxLen >= 0 and minLen > maxLen.
 func MapOfNValues[K comparable, V any](val *Generator[V], minLen int, maxLen int, keyFn func(V) K) *Generator[map[K]V] {
 	assertValidRange(minLen, maxLen)