diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index f246ab694ce..bd800ca5b73 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -3837,6 +3837,7 @@ static RegisterPrimOp primop_convertHash({
         The format of the resulting hash. Must be one of
         - `"base16"`
         - `"nix32"`
+        - `"base32"` (deprecated alias for `"nix32"`)
         - `"base64"`
         - `"sri"`