diff --git a/src/main.c3 b/src/main.c3
index b0176eb..7382ebc 100644
--- a/src/main.c3
+++ b/src/main.c3
@@ -130,7 +130,7 @@ fn int main(String[] args)
 	defer ui.free();
 
 	ui.load_font("font1", "resources/hack-nerd.ttf", 16)!!;
-	ui.sprite_atlas_create("icons", AtlasType.ATLAS_RGBA32, 512, 512)!!;
+	ui.sprite_atlas_create("icons", AtlasType.ATLAS_R8G8B8A8, 512, 512)!!;
 	ui.import_sprite_file_qoi("tux", "resources/tux.qoi")!!;
 	ui.import_sprite_file_qoi("tick", "resources/tick_sdf.qoi", SpriteType.SPRITE_MSDF)!!;
 
diff --git a/src/ugui_atlas.c3 b/src/ugui_atlas.c3
index 1976ec4..8745fd7 100644
--- a/src/ugui_atlas.c3
+++ b/src/ugui_atlas.c3
@@ -9,7 +9,7 @@ fault UgAtlasError {
 
 enum AtlasType {
 	ATLAS_GRAYSCALE,
-	ATLAS_RGBA32,
+	ATLAS_R8G8B8A8,
 }
 
 // black and white atlas
@@ -29,7 +29,7 @@ macro usz AtlasType.bpp(type)
 {
 	switch (type) {
 	case ATLAS_GRAYSCALE: return 1;
-	case ATLAS_RGBA32: return 4;
+	case ATLAS_R8G8B8A8: return 4;
 	}
 }
 
diff --git a/src/ugui_sprite.c3 b/src/ugui_sprite.c3
index 7c1d368..b4a83f2 100644
--- a/src/ugui_sprite.c3
+++ b/src/ugui_sprite.c3
@@ -36,13 +36,13 @@ struct ElemSprite {
 // name: some examples are "icons" or "images"
 fn void! SpriteAtlas.init(&this, String name, AtlasType type, ushort width, ushort height)
 {
-	// FIXME: for now only RGBA32 format is supported
-	if (type != ATLAS_RGBA32) {
+	// FIXME: for now only R8G8B8A8 format is supported
+	if (type != ATLAS_R8G8B8A8) {
 		return UgAtlasError.INVALID_TYPE?;
 	}
 
 	this.id = name.hash();
-	this.atlas.new(this.id, AtlasType.ATLAS_RGBA32, width, height)!;
+	this.atlas.new(this.id, AtlasType.ATLAS_R8G8B8A8, width, height)!;
 	this.sprites.new_init(capacity: SRITES_PER_ATLAS);
 	this.should_update = false;
 }
@@ -54,6 +54,7 @@ fn void! SpriteAtlas.free(&this)
 }
 
 // FIXME: this should throw an error when a different pixel format than the atlas' is used
+//        or convert from the source's pixel format to the atlas'
 fn Sprite*! SpriteAtlas.insert(&this, String name, SpriteType type, char[] pixels, ushort w, ushort h, ushort stride)
 {
 	Sprite s;