diff --git a/lib/datalog/scoreboard.json b/lib/datalog/scoreboard.json
index a5648c7c..e70960f4 100644
--- a/lib/datalog/scoreboard.json
+++ b/lib/datalog/scoreboard.json
@@ -1,11 +1,11 @@
 {
   "lang": "datalog",
-  "total_passed": 231,
+  "total_passed": 233,
   "total_failed": 0,
-  "total": 231,
+  "total": 233,
   "suites": [
     {"name":"tokenize","passed":26,"failed":0,"total":26},
-    {"name":"parse","passed":18,"failed":0,"total":18},
+    {"name":"parse","passed":20,"failed":0,"total":20},
     {"name":"unify","passed":28,"failed":0,"total":28},
     {"name":"eval","passed":32,"failed":0,"total":32},
     {"name":"builtins","passed":20,"failed":0,"total":20},
@@ -16,5 +16,5 @@
     {"name":"magic","passed":28,"failed":0,"total":28},
     {"name":"demo","passed":21,"failed":0,"total":21}
   ],
-  "generated": "2026-05-08T14:12:22+00:00"
+  "generated": "2026-05-08T14:16:19+00:00"
 }
diff --git a/lib/datalog/scoreboard.md b/lib/datalog/scoreboard.md
index 9d109351..b200d31a 100644
--- a/lib/datalog/scoreboard.md
+++ b/lib/datalog/scoreboard.md
@@ -1,11 +1,11 @@
 # datalog scoreboard
 
-**231 / 231 passing** (0 failure(s)).
+**233 / 233 passing** (0 failure(s)).
 
 | Suite | Passed | Total | Status |
 |-------|--------|-------|--------|
 | tokenize | 26 | 26 | ok |
-| parse | 18 | 18 | ok |
+| parse | 20 | 20 | ok |
 | unify | 28 | 28 | ok |
 | eval | 32 | 32 | ok |
 | builtins | 20 | 20 | ok |
diff --git a/lib/datalog/tests/parse.sx b/lib/datalog/tests/parse.sx
index 2af6e6ab..2080e77c 100644
--- a/lib/datalog/tests/parse.sx
+++ b/lib/datalog/tests/parse.sx
@@ -126,6 +126,16 @@
         "underscore var"
         (dl-parse "p(X) :- q(X, _).")
         (list {:body (list (list (quote q) (quote X) (quote _))) :head (list (quote p) (quote X))}))
+      (dl-pt-test!
+        "number as relation name raises"
+        (dl-pt-throws? (fn () (dl-parse "1(X) :- p(X).")))
+        true)
+
+      (dl-pt-test!
+        "var as relation name raises"
+        (dl-pt-throws? (fn () (dl-parse "P(X).")))
+        true)
+
       (dl-pt-test!
         "missing dot raises"
         (dl-pt-throws? (fn () (dl-parse "p(a)")))