diff --git a/guides/source/asset_pipeline.md b/guides/source/asset_pipeline.md
index d9dfd85860bf8b484451ecce158be681371c9cf6..4a610e8458d6485edad989eca27bc3a1bf552092 100644
--- a/guides/source/asset_pipeline.md
+++ b/guides/source/asset_pipeline.md
@@ -643,7 +643,7 @@ above. By default Rails assumes assets have been precompiled and will be
 served as static assets by your web server.
 
 During the precompilation phase an MD5 is generated from the contents of the
-compiled files, and inserted into the filenames as they are written to disc.
+compiled files, and inserted into the filenames as they are written to disk.
 These fingerprinted names are used by the Rails helpers in place of the manifest
 name.