grammar

spec/2023-07-draft.md

@@ -580,7 +580,7 @@ Sample test cases can be used in three places:
 By default the sample data for all three cases is taken from the `.in` and `.ans` file pairs under `data/sample`.
 Some problems require (slightly) different data in each of these cases.
 We allow customizing this in subdirecties `data/sample/statement` and `data/sample/download`.
-In this case it recommended to symlink identical files from these subdirectories to those in `data/sample`.
+In this case it is recommended to symlink identical files from these subdirectories to those in `data/sample`.
 
 #### Samples used by the judge
 The `data/sample` directory contains test cases similar to those in `data/secret`.