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diff --git a/src/ExitCodes.hs b/src/ExitCodes.hs
index a48980f..08acfdb 100644
--- a/src/ExitCodes.hs
+++ b/src/ExitCodes.hs
@@ -4,9 +4,11 @@
 module ExitCodes
 where
 
--- |Indicates that the command-line arguments could not be parsed.
+-- | Indicates that the command-line arguments could not be parsed.
 exit_args_parse_failed :: Int
 exit_args_parse_failed = 1
 
+-- | Indicates that the input file given on the command-line does not
+--   exist.
 exit_input_file_doesnt_exist :: Int
 exit_input_file_doesnt_exist = 2