diff --git a/lib/77bit/77bit.txt b/lib/77bit/77bit.txt
index 10e70685d..36087f48a 100644
--- a/lib/77bit/77bit.txt
+++ b/lib/77bit/77bit.txt
@@ -10,19 +10,30 @@ i3.n3 Example message                    Bits           Total  Purpose
 0.2   PA3XYZ/P R 590003 IO91NP           28 1 1 3 12 25   70   EU VHF contest
 0.3   WA9XYZ KA1ABC R 16A EMA            28 28 1 4 3 7    71   ARRL Field Day
 0.4   WA9XYZ KA1ABC R 32A EMA            28 28 1 4 3 7    71   ARRL Field Day
-0.5   71-bit telemetry                   71               71   TBD
+0.5   0123456789abcdef01                 71               71   Telemetry (18 hex)
+0.6   
 
 1     WA9XYZ/R KA1ABC/R R FN42           28 1 28 1 1 15   74   Standard msg
 2     TU; W9XYZ K1ABC R 579 MA           1 28 28 1 3 13   74   ARRL RTTY contest
 3     PA3XYZ/P GM4ABC/P R JO22           28 1 28 1 1 15   74   EU VHF contest
-4     <WA9XYZ> PJ4/KA1ABC R-11           13 53 1 1 6      74   Nonstandard calls
+4     <WA9XYZ> PJ4/KA1ABC RR73           13 58 1 2        74   Nonstandard calls
 5     ...
 6
 7
 ----------------------------------------------------------------------------------
+In case we need them, later:
+
+5     TU; W9XYZ K1ABC R 579 8 MA         1 28 28 1 3 6 7  74   CQ WW RTTY
+6     TU; W9XYZ K1ABC R 579 MA           1 28 28 1 3 13   74   CQ WPX RTTY
+----------------------------------------------------------------------------------
 NB: three 74-bit message types and two 71-bit message subtypes are still TBD.
 ----------------------------------------------------------------------------------
 
+The 28-bit callsign field includes about 19 million impossible "calls"
+that start with three digits.  That's more than 2^24 = 17,777,216, so
+these values could be used to implement a 24-bit CRC -- in addition to the
+"CQ xx" and "CQ nnn" forms, possibly enhanced a bit further.
+
 Further details:
 
 0.0 Free text, up to 13 characters.
@@ -46,7 +57,13 @@ Further details:
 
 3.  Same as Type 1, but uses /P instead of /R.  For European VHF contests. 
 
-4.  One nonstandard call with up to 10 characters, one hashed call, Roger,
-    and signal report.
+4.  One nonstandard call with up to 11 characters, one hashed call,
+    followed by <blank>, RRR, RR73, or 73.
 
+The following are tentative, not to be included in first release:
+
+5.  CQ WW RTTY  - US/Can: RST CQZ state/prov  R 579 5 NJ       R1 r3 z6 u7
+                  DX:     RST + CQzone        R 559 15         R1 r3 z6
+	     
+6.  CQ WPX RTTY - RST + serial                R 589 0013       R1 r3 n12