Update documentation for git_blob_filter_options Adds info about initializing options with git_blob_filter_options_init
diff --git a/include/git2/blob.h b/include/git2/blob.h
index c2a968c..741b28f 100644
--- a/include/git2/blob.h
+++ b/include/git2/blob.h
@@ -119,7 +119,8 @@ typedef enum {
/**
* The options used when applying filter options to a file.
*
- * Initialize with `GIT_BLOB_FILTER_OPTIONS_INIT`.
+ * Initialize with `GIT_BLOB_FILTER_OPTIONS_INIT`. Alternatively, you can
+ * use `git_blob_filter_options_init`.
*
*/
typedef struct {