diff --git a/src/liblzma/common/filter_encoder.c b/src/liblzma/common/filter_encoder.c
index c5d8f397..f0762d9a 100644
--- a/src/liblzma/common/filter_encoder.c
+++ b/src/liblzma/common/filter_encoder.c
@@ -59,7 +59,7 @@ static const lzma_filter_encoder encoders[] = {
 		.id = LZMA_FILTER_LZMA1,
 		.init = &lzma_lzma_encoder_init,
 		.memusage = &lzma_lzma_encoder_memusage,
-		.block_size = NULL, // FIXME
+		.block_size = NULL, // Not needed for LZMA1
 		.props_size_get = NULL,
 		.props_size_fixed = 5,
 		.props_encode = &lzma_lzma_props_encode,
@@ -70,7 +70,7 @@ static const lzma_filter_encoder encoders[] = {
 		.id = LZMA_FILTER_LZMA2,
 		.init = &lzma_lzma2_encoder_init,
 		.memusage = &lzma_lzma2_encoder_memusage,
-		.block_size = &lzma_lzma2_block_size, // FIXME
+		.block_size = &lzma_lzma2_block_size,
 		.props_size_get = NULL,
 		.props_size_fixed = 1,
 		.props_encode = &lzma_lzma2_props_encode,