fix

Signed-off-by: cutecutecat <junyuchen@tensorchord.ai>

src/usage/compatibility.md

@@ -1,18 +1,19 @@
-# Compatible with pgvector
+# Pgvector compatibility
 
-pgvecto.rs can be configured to be compatible with `pgvector` at: 
+Pgvecto.rs is natively compatible with pgvector at:
 - Create table
-- Create vector indexes
 - Search vectors
 
-For `create table` and `search vectors`, pgvecto.rs supports this feature natively.
+Pgvecto.rs can be configured to be compatible with pgvector at: 
+- Create vector indexes
 
-For `create vector indexes' this feature should be enabled with `SET vectors.pgvector_compat=on;`.
+This feature is called `compatibility mode`. 
 
+It can be enabled with `SET vectors.pgvector_compatibility=on;`.
 
 ## Examples
 
-It's easy to enable compatibility mode and run a search.
+It's easy to enable compatibility mode and start a vector search.
 ```sql
 DROP TABLE IF EXISTS t;
 SET vectors.pgvector_compat=on;
@@ -23,7 +24,7 @@ SELECT COUNT(1) FROM (SELECT 1 FROM t ORDER BY val <-> '[0.5,0.5,0.5]' limit 100
 DROP INDEX hnsw_l2_index;
 ```
 
-Multiply types of indices are accepted:
+Multiply types of indexes are accepted:
 ```sql
 SET vectors.pgvector_compat=on;
 -- [hnsw + vector_l2_ops] index with default options
@@ -48,7 +49,7 @@ For compatibility, we strive to maintain a consistent user experience, but there
 - Some features of pgvector are different in `compatibility mode 
 
 ### Unavailable features of pgvecto.rs
-When pgvecto.rs is running in `compatibility mode`, some features of pgvecto.rs are not available:
+When executing SQL statements in `compatibility mode', some features of pgvecto.rs are not accessible:
 - `flat` index
 - Quantization, including `scalar quantization` and `product quantization`
 - prefilter and vbase
@@ -74,6 +75,6 @@ Options for `hnsw`.
 Although in `compatibility mode', there are still differences from pgvector.
 
 Known problems are not limited to:
-- Create vector indexes is asynchronous at pgvecto.rs, instead of synchronous at pgvector
 - Query Options [ivfflat.probes](https://github.com/pgvector/pgvector#query-options-1) need to be `vectors.ivf_nprobe`, and [hnsw.ef_search](https://github.com/pgvector/pgvector?tab=readme-ov-file#query-options) need to be `vectors.hnsw_ef_search`
-- [Vector Functions](https://github.com/pgvector/pgvector?tab=readme-ov-file#vector-functions) and [Aggregate Functions](https://github.com/pgvector/pgvector?tab=readme-ov-file#aggregate-functions) are not supported
+- Create vector indexes is asynchronous at pgvecto.rs, instead of synchronous at pgvector
+- All other modules except index are not supported