diff --git a/girepository/compiler/compiler.c b/girepository/compiler/compiler.c
index 278f76ae1..b0fc59d45 100644
--- a/girepository/compiler/compiler.c
+++ b/girepository/compiler/compiler.c
@@ -144,7 +144,7 @@ log_handler (const gchar   *log_domain,
 }
 
 static GOptionEntry options[] = {
-  { "includedir", 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &includedirs, N_("Include directories in GIR search path"), NULL },
+  { "includedir", 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &includedirs, N_("Include directories in GIR search path"), N_("DIRECTORY") },
   { "output", 'o', 0, G_OPTION_ARG_FILENAME, &output, N_("Output file"), N_("FILE") },
   { "shared-library", 'l', 0, G_OPTION_ARG_FILENAME_ARRAY, &shlibs, N_("Shared library"), N_("FILE") },
   { "debug", 0, 0, G_OPTION_ARG_NONE, &debug, N_("Show debug messages"), NULL },
diff --git a/girepository/decompiler/decompiler.c b/girepository/decompiler/decompiler.c
index 51a225383..951e11d82 100644
--- a/girepository/decompiler/decompiler.c
+++ b/girepository/decompiler/decompiler.c
@@ -49,7 +49,7 @@ main (int argc, char *argv[])
   GOptionEntry options[] =
     {
       { "output", 'o', 0, G_OPTION_ARG_FILENAME, &output, N_("Output file"), N_("FILE") },
-      { "includedir", 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &includedirs, N_("Include directories in GIR search path"), NULL },
+      { "includedir", 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &includedirs, N_("Include directories in GIR search path"), N_("DIRECTORY") },
       { "all", 0, 0, G_OPTION_ARG_NONE, &show_all, N_("Show all available information"), NULL, },
       { "version", 0, 0, G_OPTION_ARG_NONE, &show_version, N_("Show program’s version number and exit"), NULL },
       { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &input, NULL, NULL },