liblzma: Add missing comments to lz_encoder.h.

diff --git a/src/liblzma/lz/lz_encoder.h b/src/liblzma/lz/lz_encoder.h
index ffcba02ce93139f131a7cd6b2c7d967e466d3b61..8d9c6d6e94146d7b3b61da29617da1e59763c0d7 100644 (file)
--- a/src/liblzma/lz/lz_encoder.h
+++ b/src/liblzma/lz/lz_encoder.h
@@ -153,9 +153,13 @@ typedef struct {
        /// Maximum search depth
        uint32_t depth;
 
-       /// TODO: Comment
+       /// Initial dictionary for the match finder to search.
        const uint8_t *preset_dict;
 
+       /// If the preset dictionary is NULL, this value is ignored.
+       /// Otherwise this member must indicate the preset dictionary's
+       /// buffer size. If this size is larger than dict_size, then only
+       /// the dict_size sized tail of the preset_dict will be used.
        uint32_t preset_dict_size;
 
 } lzma_lz_options;