diff --git a/FEATURES.md b/FEATURES.md
index 11039230..b03a0782 100644
--- a/FEATURES.md
+++ b/FEATURES.md
@@ -10,8 +10,8 @@ Section | Status | Comments
 3.1 Variables, syntactic keywords, and regions | |
 3.2 Disjointness of types | |
 3.3 External representations | |
-3.4 Storage model | |
-3.5 Proper tail recursion | |
+3.4 Storage model | | No immutable types at this time.
+3.5 Proper tail recursion | Yes |
 4.1 Primitive expression types | |
 4.2 Derived expression types | |
 4.3 Macros | |
@@ -21,13 +21,13 @@ Section | Status | Comments
 5.4 Syntax definitions | |
 5.5 Record-type definitions | |
 5.6 Libraries | |
-5.7 The REPL | |
+5.7 The REPL | Yes |
 6.1 Equivalence predicates | | `eqv?` is not implemented, it is just an alias to `eq?`
 6.2 Numbers | |
-6.3 Booleans | |
-6.4 Pairs and lists | Yes |
+6.3 Booleans | Yes | `#true` and `#false` are not recognized by parser.
+6.4 Pairs and lists | Yes | `member` functions are predicates, `member` and `assoc` do not accept `compare` argument.
 6.5 Symbols | Yes |
-6.6 Characters | |
+6.6 Characters | Partial | No unicode support, `char-ci` predicates are not implemented.
 6.7 Strings | |
 6.8 Vectors | |
 6.9 Bytevectors | |