diff --git a/src/util.py b/src/util.py
index 6f1677f..4013aaa 100644
--- a/src/util.py
+++ b/src/util.py
@@ -29,11 +29,11 @@ def timestamp_µs(): return int(datetime.datetime.now(tz=datetime.timezone.utc).
 
 prefixes = {
     # big SI prefixes
-    "Y": 24, "Z": 21, "E": 18, "P": 15, "T": 12, "G": 9, "M": 6, "k": 3, "h": 2, "da": 1,
+    "Q": 30, "R": 27, "Y": 24, "Z": 21, "E": 18, "P": 15, "T": 12, "G": 9, "M": 6, "k": 3, "h": 2, "da": 1,
     # small SI prefixes
-    "d": -1, "c": -2, "m": -3, "µ": -6, "μ": -6, "u": -6, "n": -9, "p": -12, "f": -15, "a": -18, "z": -21, "y": -24,
+    "d": -1, "c": -2, "m": -3, "µ": -6, "μ": -6, "u": -6, "n": -9, "p": -12, "f": -15, "a": -18, "z": -21, "y": -24, "r": -27, "q": -30,
     # highly dubiously useful unofficial prefixes
-    "R": 27, "r": -27, "Q": 30, "q": -30, "X": 27, "x": -27, "W": 30, "w": -30
+    "X": 27, "x": -27, "W": 30, "w": -30
 }
 number = "(-?[0-9]+(?:\.[0-9]+)?)(" + "|".join(prefixes.keys()) + ")?"