Add memory access macro summary.
diff --git a/include/freetype/internal/ftstream.h b/include/freetype/internal/ftstream.h
index e4dca0b..a579a03 100644
--- a/include/freetype/internal/ftstream.h
+++ b/include/freetype/internal/ftstream.h
@@ -166,6 +166,17 @@ FT_BEGIN_HEADER
/*
+ * function acts on increases does range for emits
+ * pointer checking frames error
+ * -------------------------------------------------------------------
+ * FT_PEEK_XXX buffer pointer no no no no
+ * FT_NEXT_XXX buffer pointer yes no no no
+ * FT_GET_XXX stream->cursor yes yes yes no
+ * FT_READ_XXX stream->pos yes yes no yes
+ */
+
+
+ /*
* `FT_PEEK_XXX' are generic macros to get data from a buffer position. No
* safety checks are performed.
*/