diff --git a/src/harfbuzz.luadoc b/src/harfbuzz.luadoc
index 169aea8..03e76d4 100644
--- a/src/harfbuzz.luadoc
+++ b/src/harfbuzz.luadoc
@@ -281,9 +281,51 @@
 --- Wraps `HB_BUFFER_CLUSTER_LEVEL_DEFAULT`.
 --  @field Buffer.CLUSTER_LEVEL_DEFAULT
 
+--- Buffer Flags.
+--  @section buffer-flags
+
+--- Wraps `HB_BUFFER_FLAG_DEFAULT`.
+-- @field Buffer.FLAG_DEFAULT
+
+--- Wraps `HB_BUFFER_FLAG_BOT`.
+-- @field Buffer.FLAG_BOT
+
+--- Wraps `HB_BUFFER_FLAG_EOT`.
+-- @field Buffer.FLAG_EOT
+
+--- Wraps `HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES`.
+-- @field Buffer.FLAG_PRESERVE_DEFAULT_IGNORABLES
+
+--- Wraps `HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES`.
+-- @field Buffer.FLAG_REMOVE_DEFAULT_IGNORABLES
+
+--- Wraps `HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE`.
+-- @field Buffer.FLAG_DO_NOT_INSERT_DOTTED_CIRCLE
+
+--- Wraps `HB_BUFFER_FLAG_VERIFY`.
+-- @field Buffer.FLAG_VERIFY
+
+--- Wraps `HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT`.
+-- @field Buffer.FLAG_PRODUCE_UNSAFE_TO_CONCAT
+
+--- Wraps `HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL`.
+-- @field Buffer.FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL
+
+--- Wraps `HB_BUFFER_FLAG_DEFINED`.
+-- @field Buffer.FLAG_DEFINED
+
+--- Glyph Flags.
+--  @section glyph-flags
+
 --- Wraps `HB_GLYPH_FLAG_UNSAFE_TO_BREAK`.
 -- @field Buffer.GLYPH_FLAG_UNSAFE_TO_BREAK
 
+--- Wraps `HB_GLYPH_FLAG_UNSAFE_TO_CONCAT`.
+-- @field Buffer.GLYPH_FLAG_UNSAFE_TO_CONCAT
+
+--- Wraps `HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL`.
+-- @field Buffer.GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL
+
 --- Wraps `HB_GLYPH_FLAG_DEFINED`.
 -- @field Buffer.GLYPH_FLAG_DEFINED
 
diff --git a/src/luaharfbuzz/buffer.c b/src/luaharfbuzz/buffer.c
index 21e9bb2..9f76d19 100644
--- a/src/luaharfbuzz/buffer.c
+++ b/src/luaharfbuzz/buffer.c
@@ -328,7 +328,13 @@ static const struct luahb_constant_t buffer_constants[] = {
   { "FLAG_PRESERVE_DEFAULT_IGNORABLES", HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES },
   { "FLAG_REMOVE_DEFAULT_IGNORABLES", HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES },
   { "FLAG_DO_NOT_INSERT_DOTTED_CIRCLE", HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE },
+  { "FLAG_VERIFY", HB_BUFFER_FLAG_VERIFY },
+  { "FLAG_PRODUCE_UNSAFE_TO_CONCAT", HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT },
+  { "FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL", HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL },
+  { "FLAG_DEFINED", HB_BUFFER_FLAG_DEFINED },
   { "GLYPH_FLAG_UNSAFE_TO_BREAK", HB_GLYPH_FLAG_UNSAFE_TO_BREAK },
+  { "GLYPH_FLAG_UNSAFE_TO_CONCAT", HB_GLYPH_FLAG_UNSAFE_TO_CONCAT },
+  { "GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL", HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL },
   { "GLYPH_FLAG_DEFINED", HB_GLYPH_FLAG_DEFINED },
   { NULL, 0 }
 };