diff --git a/docs/STYLES.md b/docs/STYLES.md
index c89a162621..51ee3e04b3 100644
--- a/docs/STYLES.md
+++ b/docs/STYLES.md
@@ -44,6 +44,8 @@ Map styles are defined in text files located in `data/styles/clear/include/`:
 * City-specific subway networks [`Subways.mapcss`](../data/styles/clear/include/Subways.mapcss)
 * Light (default) theme colors: [`style-clear/colors.mapcss`](../data/styles/clear/style-clear/colors.mapcss)
 * Dark/night theme colors: [`style-night/colors.mapcss`](../data/styles/clear/style-night/colors.mapcss)
+* Priorities of overlays (icons, captions..) [`priorities_4_overlays.prio.txt`](../data/styles/clear/include/priorities_4_overlays.prio.txt)
+* Priorities of lines and areas [`priorities_3_FG.prio.txt`](../data/styles/clear/include/priorities_3_FG.prio.txt), [`priorities_2_BG-top.prio.txt`](../data/styles/clear/include/priorities_2_BG-top.prio.txt), [`priorities_1_BG-by-size.prio.txt`](../data/styles/clear/include/priorities_1_BG-by-size.prio.txt)
 
 There is a separate set of these style files for the navigation mode in `data/styles/vehicle/`.
 
@@ -62,21 +64,21 @@ preferably look for icons in [collections OM uses already](../data/copyright.htm
 
 1. Add it into `data/mapcss-mapping.csv` (or better replace existing `deprecated` line) to make OM import it from OSM
 2. If necessary merge similar tags in via `data/replaced_tags.txt`
-3. Add a new icon (see [above](#how-to-add-a-new-icon))
-4. If a new POI should be OSM-addable/editable then add it to `data/editor.config`
-5. Add new type translation into `data/strings/types_strings.txt`
-6. Add search keywords into `data/categories.txt`
-7. Run `tools/unix/generate_localizations.sh` to validate and distribute translations into iOS and Android
-8. Add new or fix current classifier tests at `/generator/generator_tests/osm_type_tests.cpp` if you can
-9. [Test](#testing-your-changes) your changes
-10. Relax and wait for the next maps update :)
+3. Define a priority for the new feature type in e.g. [`priorities_4_overlays.prio.txt`](../data/styles/clear/include/priorities_4_overlays.prio.txt) and/or other priorities files
+4. Add a new icon (see [above](#how-to-add-a-new-icon)) and/or other styling (area, line..)
+5. If a new POI should be OSM-addable/editable then add it to `data/editor.config`
+6. Add new type translation into `data/strings/types_strings.txt`
+7. Add search keywords into `data/categories.txt`
+8. Run `tools/unix/generate_localizations.sh` to validate and distribute translations into iOS and Android
+9. Add new or fix current classifier tests at `/generator/generator_tests/osm_type_tests.cpp` if you can
+10. [Test](#testing-your-changes) your changes
+11. Relax and wait for the next maps update :)
 
 ## Testing your changes
 
 The most convenient way is using [the desktop app](INSTALL.md#desktop-app).
-There is a Designer version of it also, which facilitates development
-by rebuilding styles and symbols quickly. Though building of the Designer tool
-is limited to macOS at the moment.
+(there is a "Designer" version of it also, which facilitates development
+by rebuilding styles and symbols quickly, but it's broken as of now, please help fix it!)
 
 To test on Android or iOS device either re-build the app or put
 the compiled style files (e.g. `drules_proto_clear.bin`) into
@@ -93,11 +95,10 @@ not take effect until map's visibility/scale index is rebuilt:
 ```
 4. The index of `Georgia.mwm` will be updated in place
 
-Sometimes (if the visibility change crosses a geometry index boundary)
-a whole map needs to be [regenerated](MAPS.md) for the feature to become visible.
-
-If e.g. `area` style rules are added for a feature that didn't have them before,
-then the rules won't take effect until map files are regenerated.
+A whole map needs to be [regenerated](MAPS.md) for the changes to take effect if:
+* the visibility change crosses a geometry index boundary
+* e.g. `area` style rules are added for a feature that didn't have them before
+* a new feature type is added or the mapping of existing one is changed
 
 ## Technical details