diff --git a/src/docs/tech/celerity.diviner b/src/docs/tech/celerity.diviner
--- a/src/docs/tech/celerity.diviner
+++ b/src/docs/tech/celerity.diviner
@@ -51,7 +51,7 @@
 These references point at `/res/` URIs, which are handled by
 @{class:CelerityResourceController}. It responds to these requests and delivers
 the relevant resources and packages, managing cache lifetimes and handling any
-neessary preprocessing. It uses @{class:CelerityResourceMap} to locate resources
+necessary preprocessing. It uses @{class:CelerityResourceMap} to locate resources
 and read packaging rules.
 
 The dependency and packaging maps are generated by `bin/celerity map`,