diff --git a/libraries/advisory_rules.txt b/libraries/advisory_rules.txt
index da95d48329..c193f852d3 100644
--- a/libraries/advisory_rules.txt
+++ b/libraries/advisory_rules.txt
@@ -139,7 +139,7 @@ rule 'Query cache fragmentation' [!fired('Query cache disabled')]
 	Qcache_free_blocks / (Qcache_total_blocks / 2) * 100
 	value > 20
 	The query cache is considerably fragmented.
-	Severe fragmentation is likely to (further) increase Qcache_lowmem_prunes. This might be caused by many Query cache low memory prunes due to {query_cache_size} being too small. For a immediate but short lived fix you can flush the query cache (might lock the query cache for a long time). Carefully adjusting {query_cache_min_res_unit} to a lower value might help too, e.g. you can set it to the average size of your queries in the cache using this formula: (query_cache_size � qcache_free_memory) / qcache_queries_in_cache
+	Severe fragmentation is likely to (further) increase Qcache_lowmem_prunes. This might be caused by many Query cache low memory prunes due to {query_cache_size} being too small. For a immediate but short lived fix you can flush the query cache (might lock the query cache for a long time). Carefully adjusting {query_cache_min_res_unit} to a lower value might help too, e.g. you can set it to the average size of your queries in the cache using this formula: (query_cache_size - qcache_free_memory) / qcache_queries_in_cache
 	The cache is currently fragmented by %s% , with 100% fragmentation meaning that the query cache is an alternating pattern of free and used blocks. This value should be below 20%. | round(value,1)
 
 rule 'Query cache low memory prunes' [Qcache_inserts > 0 && !fired('Query cache disabled')]