diff --git a/PROTOCOL.md b/PROTOCOL.md
index dd3c27d..c87f644 100644
--- a/PROTOCOL.md
+++ b/PROTOCOL.md
@@ -104,7 +104,7 @@ In each request, the client will send a pair of time-scrambled hashes $(x_1, x_2
 
 The client implements 3 protocols according to the **keyset state** :
 - 0 : `NORMAL` - default authentication protocol.
-- 1 : `SWITCH` - default protocol variation to switch to a new keyset when the current one is consumed (*i.e. when $n$ \leq $min+belt$*).
+- 1 : `SWITCH` - default protocol variation to switch to a new keyset when the current one is consumed (*i.e. when $n$ $\leq$ $min+belt$*).
 - 2 : `RESCUE` - process the proof of work after receiving the server's challenge when there is a desynchronisation and generate a new keyset.
 
 When the client switches to a new key, it has to store the new keyset along the current one, in order not to lose its authentication if the network fails.