diff --git a/COMPAT.md b/COMPAT.md
index 79a037a5..07e9ccf2 100644
--- a/COMPAT.md
+++ b/COMPAT.md
@@ -501,7 +501,9 @@ UUID's in Limbo are `blobs` by default.
 | uuid_str(X)           | Yes    | Convert a valid UUID to string                                |
 | uuid_blob(X)          | Yes    | Convert a valid UUID to blob                                  |
 
-### REGEXP
+### regexp
+
+The `regexp` extension is compatible with [sqlean-regexp](https://github.com/nalgeon/sqlean/blob/main/docs/regexp.md).
 
 | Function                                       | Status | Comment | 
 |------------------------------------------------|--------|---------|
@@ -509,4 +511,4 @@ UUID's in Limbo are `blobs` by default.
 | regexp_like(source, pattern)                   | Yes    |         |
 | regexp_substr(source, pattern)                 | Yes    |         |
 | regexp_capture(source, pattern[, n])           | No     |         |
-| regexp_replace(source, pattern, replacement)   | No     |         |
\ No newline at end of file
+| regexp_replace(source, pattern, replacement)   | No     |         |