diff --git a/src/hnsw.h b/src/hnsw.h
index e79d894..76c7c6c 100644
--- a/src/hnsw.h
+++ b/src/hnsw.h
@@ -32,6 +32,7 @@
 #define HNSW_UPDATE_LOCK 	0
 #define HNSW_SCAN_LOCK		1
 
+/* HNSW parameters */
 #define HNSW_DEFAULT_M	16
 #define HNSW_MIN_M	2
 #define HNSW_MAX_M		100
@@ -42,6 +43,7 @@
 #define HNSW_MIN_EF_SEARCH		1
 #define HNSW_MAX_EF_SEARCH		1000
 
+/* Tuple types */
 #define HNSW_ELEMENT_TUPLE_TYPE  1
 #define HNSW_NEIGHBOR_TUPLE_TYPE 2
 
diff --git a/src/ivfflat.h b/src/ivfflat.h
index 2c18fd4..c68cfcd 100644
--- a/src/ivfflat.h
+++ b/src/ivfflat.h
@@ -40,6 +40,7 @@
 #define IVFFLAT_METAPAGE_BLKNO	0
 #define IVFFLAT_HEAD_BLKNO		1	/* first list page */
 
+/* IVFFlat parameters */
 #define IVFFLAT_DEFAULT_LISTS	100
 #define IVFFLAT_MAX_LISTS		32768