diff --git a/docs/api/runtime-calls.md b/docs/api/runtime-calls.md
index a1bc106c1a017bc65f7c55a12bc9a9575040b91b..011ff2ce4dc5c39f6d2b034bfc96285c1ebeebf8 100644
--- a/docs/api/runtime-calls.md
+++ b/docs/api/runtime-calls.md
@@ -325,7 +325,7 @@ Upgrade a specified account.
 
 This will waive the transaction fee if at least all but 10% of the accounts needed to
 be upgraded. (We let some not have to be upgraded just in order to allow for the
-possibililty of churn).
+possibility of churn).
 Set the regular balance of a given account.
 
 The dispatch origin for this call is `root`.