diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a26601..c7fe0ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 * improve NULL pointer handling [dloebl]
 * improve GFlags argument handling [jcupitt]
+* add missing flag and enum docs [jcupitt]
 
 ## Version 2.2.4 (2025-06-05)
 
diff --git a/lib/vips/combine.rb b/lib/vips/combine.rb
new file mode 100644
index 0000000..4bc7ef4
--- /dev/null
+++ b/lib/vips/combine.rb
@@ -0,0 +1,10 @@
+module Vips
+  # How to combine values, see for example {Image#compass}.
+  #
+  # * `:max` take the maximum of the possible values
+  # * `:sum` sum all the values
+  # * `:min` take the minimum value
+
+  class Combine < Symbol
+  end
+end
diff --git a/lib/vips/fail_on.rb b/lib/vips/fail_on.rb
new file mode 100644
index 0000000..520a2b7
--- /dev/null
+++ b/lib/vips/fail_on.rb
@@ -0,0 +1,15 @@
+module Vips
+  # How sensitive loaders are to errors, from never stop (very insensitive),
+  # to stop on the smallest warning (very sensitive).
+  #
+  # Each implies the ones before it, so `:error` implies `:truncated`, for
+  # example.
+  #
+  # *   `:none` never stop
+  # *   `:truncated` stop on image truncated, nothing else
+  # *   `:error` stop on serious error or truncation
+  # *   `:warning` stop on anything, even warnings
+
+  class FailOn < Symbol
+  end
+end
diff --git a/lib/vips/foreign_dz_container.rb b/lib/vips/foreign_dz_container.rb
new file mode 100644
index 0000000..d83d09f
--- /dev/null
+++ b/lib/vips/foreign_dz_container.rb
@@ -0,0 +1,10 @@
+module Vips
+  # The container format to use
+  #
+  # *   `:fs` write tiles to the filesystem
+  # *   `:zip` write tiles to a zip file
+  # *   `:szi` write to a szi file
+
+  class ForeignDzContainer < Symbol
+  end
+end
diff --git a/lib/vips/foreign_dz_depth.rb b/lib/vips/foreign_dz_depth.rb
new file mode 100644
index 0000000..f6f33af
--- /dev/null
+++ b/lib/vips/foreign_dz_depth.rb
@@ -0,0 +1,10 @@
+module Vips
+  # How many pyramid layers to create.
+  #
+  # *   `:onepixel` create layers down to 1x1 pixel
+  # *   `:onetile` create layers down to 1x1 tile
+  # *   `:one` only create a single layer
+
+  class ForeignDzDepth < Symbol
+  end
+end
diff --git a/lib/vips/foreign_dz_layout.rb b/lib/vips/foreign_dz_layout.rb
new file mode 100644
index 0000000..7503e18
--- /dev/null
+++ b/lib/vips/foreign_dz_layout.rb
@@ -0,0 +1,12 @@
+module Vips
+  # What directory layout and metadata standard to use.
+  #
+  # *   `:dz` use DeepZoom directory layout
+  # *   `:zoomify` use Zoomify directory layout
+  # *   `:google` use Google maps directory layout
+  # *   `:iiif` use IIIF v2 directory layout
+  # *   `:iiif3` use IIIF v3 directory layout
+
+  class ForeignDzLayout < Symbol
+  end
+end
diff --git a/lib/vips/foreign_heif_compression.rb b/lib/vips/foreign_heif_compression.rb
new file mode 100644
index 0000000..0601e04
--- /dev/null
+++ b/lib/vips/foreign_heif_compression.rb
@@ -0,0 +1,11 @@
+module Vips
+  # The compression format to use inside a HEIF container
+  #
+  # *   `:hevc` x265
+  # *   `:avc` x264
+  # *   `:jpeg` jpeg
+  # *   `:av1` aom
+
+  class ForeignHeifCompression < Symbol
+  end
+end
diff --git a/lib/vips/foreign_heif_encoder.rb b/lib/vips/foreign_heif_encoder.rb
new file mode 100644
index 0000000..c3f3df8
--- /dev/null
+++ b/lib/vips/foreign_heif_encoder.rb
@@ -0,0 +1,11 @@
+module Vips
+  # The selected encoder to use.
+  #
+  # *   `:auto` auto
+  # *   `:rav1e` RAV1E
+  # *   `:svt` SVT-AV1
+  # *   `:x265` x265
+
+  class ForeignHeifEncoder < Symbol
+  end
+end
diff --git a/lib/vips/foreign_keep.rb b/lib/vips/foreign_keep.rb
new file mode 100644
index 0000000..26871e4
--- /dev/null
+++ b/lib/vips/foreign_keep.rb
@@ -0,0 +1,13 @@
+module Vips
+  # Savers can be given a set of metadata items to keep.
+  #
+  # *   `:none` remove all metadata
+  # *   `:exif` keep EXIF metadata
+  # *   `:xmp` keep XMP metadata
+  # *   `:iptc` keep IPTC metadata
+  # *   `:icc` keep ICC profiles
+  # *   `:other` keep other metadata
+
+  class ForeignKeep < Symbol
+  end
+end
diff --git a/lib/vips/foreign_png_filter.rb b/lib/vips/foreign_png_filter.rb
new file mode 100644
index 0000000..fb928bd
--- /dev/null
+++ b/lib/vips/foreign_png_filter.rb
@@ -0,0 +1,13 @@
+module Vips
+  # The set of filters for PNG save. See http://www.w3.org/TR/PNG-Filters.html
+  #
+  # *   `:none` no filtering
+  # *   `:sub` difference to the left
+  # *   `:up` difference up
+  # *   `:avg` average of left and up
+  # *   `:paeth` pick best neighbor predictor automatically
+  # *   `:all` adaptive
+
+  class ForeignPngFilter < Symbol
+  end
+end
diff --git a/lib/vips/foreign_ppm_format.rb b/lib/vips/foreign_ppm_format.rb
new file mode 100644
index 0000000..4ef2827
--- /dev/null
+++ b/lib/vips/foreign_ppm_format.rb
@@ -0,0 +1,12 @@
+module Vips
+  # The netpbm file format to save as.
+  #
+  # *   `:pbm` portable bitmap
+  # *   `:pgm` portable greymap
+  # *   `:ppm` portable pixmap
+  # *   `:pfm` portable float map
+  # *   `:pnm` portable anymap
+
+  class ForeignPpmFormat < Symbol
+  end
+end
diff --git a/lib/vips/foreign_subsample.rb b/lib/vips/foreign_subsample.rb
new file mode 100644
index 0000000..deb9f50
--- /dev/null
+++ b/lib/vips/foreign_subsample.rb
@@ -0,0 +1,10 @@
+module Vips
+  # Set subsampling mode.
+  #
+  # *   `:auto` prevent subsampling when quality >= 90
+  # *   `:on` always perform subsampling
+  # *   `:off` never perform subsampling
+
+  class ForeignSubsample < Symbol
+  end
+end
diff --git a/lib/vips/foreign_tiff_compression.rb b/lib/vips/foreign_tiff_compression.rb
new file mode 100644
index 0000000..b6aec3c
--- /dev/null
+++ b/lib/vips/foreign_tiff_compression.rb
@@ -0,0 +1,16 @@
+module Vips
+  # The compression types supported by the tiff writer.
+  #
+  # *   `:none` no compression
+  # *   `:jpeg` jpeg compression
+  # *   `:deflate` deflate (zip) compression
+  # *   `:packbits` packbits compression
+  # *   `:ccittfax4` fax4 compression
+  # *   `:lzw` LZW compression
+  # *   `:webp` WEBP compression
+  # *   `:zstd` ZSTD compression
+  # *   `:jp2k` JP2K compression
+
+  class ForeignTiffCompression < Symbol
+  end
+end
diff --git a/lib/vips/foreign_tiff_predictor.rb b/lib/vips/foreign_tiff_predictor.rb
new file mode 100644
index 0000000..3141558
--- /dev/null
+++ b/lib/vips/foreign_tiff_predictor.rb
@@ -0,0 +1,10 @@
+module Vips
+  # The predictor can help deflate and lzw compression.
+  #
+  # *   `:none` no prediction
+  # *   `:horizontal` horizontal differencing
+  # *   `:float` float predictor
+
+  class ForeignTiffPredictor < Symbol
+  end
+end
diff --git a/lib/vips/foreign_tiff_resunit.rb b/lib/vips/foreign_tiff_resunit.rb
new file mode 100644
index 0000000..80c199f
--- /dev/null
+++ b/lib/vips/foreign_tiff_resunit.rb
@@ -0,0 +1,9 @@
+module Vips
+  # Use inches or centimeters as the resolution unit for a tiff file.
+  #
+  # *   `:cm` use centimeters
+  # *   `:inch` use inches
+
+  class ForeignTiffResunit < Symbol
+  end
+end
diff --git a/lib/vips/foreign_webp_preset.rb b/lib/vips/foreign_webp_preset.rb
new file mode 100644
index 0000000..3e400df
--- /dev/null
+++ b/lib/vips/foreign_webp_preset.rb
@@ -0,0 +1,13 @@
+module Vips
+  # Tune lossy encoder settings for different image types.
+  #
+  # *   `:default` default preset
+  # *   `:picture` digital picture, like portrait, inner shot
+  # *   `:photo` outdoor photograph, with natural lighting
+  # *   `:drawing` hand or line drawing, with high-contrast details
+  # *   `:icon` small-sized colorful images
+  # *   `:text` text-like
+
+  class ForeignWebpPreset < Symbol
+  end
+end
diff --git a/lib/vips/intent.rb b/lib/vips/intent.rb
new file mode 100644
index 0000000..8ce3622
--- /dev/null
+++ b/lib/vips/intent.rb
@@ -0,0 +1,12 @@
+module Vips
+  # The rendering intent.
+  #
+  # * `:perceptual` perceptual rendering intent
+  # * `:relative` relative colorimetric rendering intent
+  # * `:saturation` saturation rendering intent
+  # * `:absolute` absolute colorimetric rendering intent
+  # * `:auto` the rendering intent that the profile suggests
+
+  class Intent < Symbol
+  end
+end
diff --git a/lib/vips/interpretation.rb b/lib/vips/interpretation.rb
index 96f314e..9005311 100644
--- a/lib/vips/interpretation.rb
+++ b/lib/vips/interpretation.rb
@@ -6,7 +6,6 @@ module Vips
   # * `:multiband` generic many-band image
   # * `:b_w` some kind of single-band image
   # * `:histogram` a 1D image, eg. histogram or lookup table
-  # * `:fourier` image is in fourier space
   # * `:xyz` the first three bands are CIE XYZ
   # * `:lab` pixels are in CIE Lab space
   # * `:cmyk` the first four bands are in CMYK space
@@ -16,12 +15,14 @@ module Vips
   # * `:lch` pixels are in CIE LCh space
   # * `:labs` CIE LAB coded as three signed 16-bit values
   # * `:srgb` pixels are sRGB
-  # * `:hsv` pixels are HSV
-  # * `:scrgb` pixels are scRGB
   # * `:yxy` pixels are CIE Yxy
+  # * `:fourier` image is in fourier space
   # * `:rgb16` generic 16-bit RGB
   # * `:grey16` generic 16-bit mono
   # * `:matrix` a matrix
+  # * `:scrgb` pixels are scRGB
+  # * `:hsv` pixels are HSV
+
   class Interpretation < Symbol
   end
 end
diff --git a/lib/vips/kernel.rb b/lib/vips/kernel.rb
index 5c7a513..69cd913 100644
--- a/lib/vips/kernel.rb
+++ b/lib/vips/kernel.rb
@@ -4,16 +4,19 @@ module Vips
   #
   # At least these should be available:
   #
-  # *   `:nearest` Nearest-neighbour interpolation.
-  # *   `:linear` Linear interpolation.
-  # *   `:cubic` Cubic interpolation.
-  # *   `:lanczos2` Two-lobe Lanczos
-  # *   `:lanczos3` Three-lobe Lanczos
+  # *   `:nearest` nearest-neighbour interpolation
+  # *   `:linear` linear interpolation
+  # *   `:cubic` cubic interpolation
+  # *   `:mitchell` Mitchell interpolation
+  # *   `:lanczos2` two-lobe Lanczos
+  # *   `:lanczos3` three-lobe Lanczos
+  # *   `:mks2013` convolve with Magic Kernel Sharp 2013
+  # *   `:mks2021` convolve with Magic Kernel Sharp 2021
   #
   #  For example:
   #
   #  ```ruby
-  #  im = im.resize 3, :kernel => :lanczos2
+  #  im = im.resize 3, kernel: :lanczos2
   #  ```
 
   class Kernel < Symbol
diff --git a/lib/vips/operation_morphology.rb b/lib/vips/operation_morphology.rb
new file mode 100644
index 0000000..02bc2bc
--- /dev/null
+++ b/lib/vips/operation_morphology.rb
@@ -0,0 +1,9 @@
+module Vips
+  # Pick a morphological operator.
+  #
+  # *   `:erode`  true if all set
+  # *   `:dilate` true if any set
+
+  class OperationMorphology < Symbol
+  end
+end
diff --git a/lib/vips/pcs.rb b/lib/vips/pcs.rb
new file mode 100644
index 0000000..1edb046
--- /dev/null
+++ b/lib/vips/pcs.rb
@@ -0,0 +1,10 @@
+module Vips
+  # Pick a Profile Connection Space for {Image#icc_import} and
+  # {Image#icc_export}`.
+  #
+  # *   `:lab` use CIELAB D65 as the Profile Connection Space
+  # *   `:xyz` use XYZ as the Profile Connection Space
+
+  class PCS < Symbol
+  end
+end
diff --git a/lib/vips/precision.rb b/lib/vips/precision.rb
new file mode 100644
index 0000000..01207be
--- /dev/null
+++ b/lib/vips/precision.rb
@@ -0,0 +1,10 @@
+module Vips
+  # How accurate an operation should be.
+  #
+  # *   `:integer` int everywhere
+  # *   `:float` float everywhere
+  # *   `:approximate` approximate integer output
+
+  class Precision < Symbol
+  end
+end
diff --git a/lib/vips/region_shrink.rb b/lib/vips/region_shrink.rb
new file mode 100644
index 0000000..13f556d
--- /dev/null
+++ b/lib/vips/region_shrink.rb
@@ -0,0 +1,13 @@
+module Vips
+  # ow to calculate the output pixels when shrinking a 2x2 region.
+  #
+  # *   `:mean` use the average
+  # *   `:median` use the median
+  # *   `:mode` use the mode
+  # *   `:max` use the maximum
+  # *   `:min` use the minimum
+  # *   `:nearest` use the top-left pixel
+
+  class RegionShrink < Symbol
+  end
+end
diff --git a/lib/vips/sdf_shape.rb b/lib/vips/sdf_shape.rb
new file mode 100644
index 0000000..1ab35f0
--- /dev/null
+++ b/lib/vips/sdf_shape.rb
@@ -0,0 +1,11 @@
+module Vips
+  # The SDF to generate, see {Image.sdf}.
+  #
+  # *   `:circle` a circle at @a, radius @r
+  # *   `:box` a box from @a to @b
+  # *   `:rounded_box` a box with rounded @corners from @a to @b
+  # *   `:line` a line from @a to @b
+
+  class SdfShape < Symbol
+  end
+end
diff --git a/lib/vips/text_wrap.rb b/lib/vips/text_wrap.rb
new file mode 100644
index 0000000..53da2db
--- /dev/null
+++ b/lib/vips/text_wrap.rb
@@ -0,0 +1,11 @@
+module Vips
+  # Sets the word wrapping style for {Image#text} when used with a
+  # maximum width.
+  #
+  # *   `:char` wrap at character boundaries
+  # *   `:word_char` wrap at word boundaries, but fall back to character boundaries if there is not enough space for a full word
+  # *   `:none` no wrapping
+
+  class TextWrap < Symbol
+  end
+end