diff --git a/docs/server/concepts.md b/docs/server/concepts.md
index 0809ee4c..8538cc67 100644
--- a/docs/server/concepts.md
+++ b/docs/server/concepts.md
@@ -10,7 +10,7 @@ This page explains concepts relating to the InspIRCd Spanning Tree protocol.
 
 ### Membership Identifier
 
-A membership identifier is an unsigned 64-bit integer that represents a user's membership of a channel. They are specific to a user and channel so multiple memberships may use the same membership id as long as both the user and channel are different.
+A membership identifier is an unsigned 64-bit integer that represents a user's membership of a channel. They are specific to a user and channel so multiple memberships may use the same membership id as long as either the user or channel are different.
 
 ### Message Routing