diff --git a/content/runbooks/prometheus/PrometheusMissingRuleEvaluations.md b/content/runbooks/prometheus/PrometheusMissingRuleEvaluations.md
index 41c2eca..0163f2f 100644
--- a/content/runbooks/prometheus/PrometheusMissingRuleEvaluations.md
+++ b/content/runbooks/prometheus/PrometheusMissingRuleEvaluations.md
@@ -15,7 +15,7 @@ Metrics and alerts may be missing or inaccurate.
 
 ## Diagnosis
 
-Check which rules fail, try to calcuate them differently.
+Check which rules fail, try to calculate them differently.
 
 ## Mitigation