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diff --git a/lib/stwcs/gui/apply_headerlet.help b/lib/stwcs/gui/apply_headerlet.help
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+++ b/lib/stwcs/gui/apply_headerlet.help
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+This task applies a headerlet to a science observation to update either the
+PRIMARY WCS or to add it as an alternate WCS. 
+
+filename = ""
+hdrlet = ""
+attach = True
+primary = True
+archive = True
+force = False
+wcskey = ""
+wcsname = ""
+verbose = False
+
+Parameters
+----------
+filename: string
+         File name of science observation whose WCS solution will be updated
+hdrlet: string
+         Headerlet file
+attach: boolean
+        True (default): append headerlet to FITS file as a new extension.
+primary: boolean
+        Specify whether or not to replace PRIMARY WCS with WCS from headerlet.
+archive: boolean
+        True (default): before updating, create a headerlet with the
+        WCS old solution.
+force: boolean
+        If True, this will cause the headerlet to replace the current PRIMARY
+        WCS even if it has a different distortion model. [Default: False]
+wcskey: string
+      Key value (A-Z, except O) for this alternate WCS
+      If None, the next available key will be used 
+wcsname: string
+      Name to be assigned to this alternate WCS
+      WCSNAME is a required keyword in a Headerlet but this allows the
+      user to change it as desired.
+
+verbose: False or a python logging level
+         (one of 'INFO', 'DEBUG' logging levels)
+         (an integer representing a logging level)