diff --git a/doc/Protocol.md b/doc/Protocol.md
index 3568524e71c5b7e687f64bdd7a42cd3275c06662..6d6fa1024f024eb726ad39534bc98ce6e0adc34b 100644
--- a/doc/Protocol.md
+++ b/doc/Protocol.md
@@ -2265,7 +2265,7 @@ If `HEAD.number > 0`:
     
 ####### BR_G44 - ENTRY.isReplay
 
-    reducable = GLOBAL_CINDEX[issuer=ENTRY.issuer,receiver=ENTRY.receiver,expired_on=0]
+    reducable = GLOBAL_CINDEX[issuer=ENTRY.issuer,receiver=ENTRY.receiver]
     
 If `count(reducable) == 0`:
 
@@ -2274,12 +2274,16 @@ If `count(reducable) == 0`:
 Else:
 
     ENTRY.isReplay = reduce(reducable).expired_on == 0
+    
+> Means:
+>  * if no entry exists, this cannot be a replay
+>  * if entries exist, then it is a replay only if the reduction is not expired yet
 
 ####### BR_G44.2 - ENTRY.isReplayable
 
 If `HEAD.number > 0 && HEAD~1.version > 10` :
 
-    reducable = GLOBAL_CINDEX[issuer=ENTRY.issuer,receiver=ENTRY.receiver,expired_on=0]
+    reducable = GLOBAL_CINDEX[issuer=ENTRY.issuer,receiver=ENTRY.receiver]
 
     If `count(reducable) == 0`:
     
@@ -2294,6 +2298,10 @@ Else:
 
 EndIf
     
+> Means:
+>  * if non-root block in v11: the certification is replayable if no entries exist or if their reduction is passed
+>  * if root or <= v10: replayability concept did not exist
+    
 ####### BR_G45 - ENTRY.sigOK
 
     ENTRY.sigOK = SIG_CHECK_CERT(REDUCE(GLOBAL_IINDEX[pub=ENTRY.receiver]), ENTRY)