diff --git a/assets/localisation/en-US/alice.csv b/assets/localisation/en-US/alice.csv
index 875bbc269..d779b5e1c 100644
--- a/assets/localisation/en-US/alice.csv
+++ b/assets/localisation/en-US/alice.csv
@@ -1878,7 +1878,7 @@ amsg_embargod;The nation has been embargoed
 save_name_label;File name (blank = auto)
 save_warning_tooltip;A file with this name already exists
 production_window_title;Production
-production_combine_types_toggle;Combine Types
+production_combine_types_toggle;Collapse Types
 production_table_name_header;Name
 production_table_size_header;Size
 production_table_amount_header;Quantity
diff --git a/docs/features/out-of-battle.md b/docs/features/out-of-battle.md
index f5a15f725..c11f982d4 100644
--- a/docs/features/out-of-battle.md
+++ b/docs/features/out-of-battle.md
@@ -35,3 +35,13 @@
 
 # US18 Ships repairs
 
+# US101 Sieges and Occupations
+
+| AC1 | Forts are built once with construction cost of some goods comparable to an extra factory level. |
+| AC2 | Forts reduce siege speed by alice_fort_siege_slowdown factor (0.75 by default) per level. |
+| AC3 | Forts increase hostile siege attrition by state.defines.alice_fort_siege_attrition_per_level per level (0.35 by default). | 
+| AC4 | Forts moderately impact victory points score of a province (+1 per fort level). |
+| AC5 | Engineers reduce the effective fort level. Number of engineers required to reduce by 1 level depends on the sieging army size. At least state.defines.engineer_unit_ratio required (0.1 by default) |
+| AC6 | Recon units increase occupation speed of any province. At least state.defines.recon_unit_ratio is required (0.1 by default) |
+| AC7 | Nation sieges its owned provinces 25% faster. |
+| AC8 | Nation sieges its core provinces 10% faster. |
diff --git a/src/gui/gui_province_window.cpp b/src/gui/gui_province_window.cpp
index d85c54c0c..03418d874 100644
--- a/src/gui/gui_province_window.cpp
+++ b/src/gui/gui_province_window.cpp
@@ -831,6 +831,7 @@ class province_building_expand_button : public button_element_base {
 
 	void button_action(sys::state& state) noexcept override {
 		auto content = retrieve<dcon::province_id>(state, parent);
+		// US101AC1
 		command::begin_province_building_construction(state, state.local_player_nation, content, Value);
 	}
 	virtual void button_shift_action(sys::state& state) noexcept override {
diff --git a/src/military/military.cpp b/src/military/military.cpp
index 8c53b1849..c18dc7e49 100644
--- a/src/military/military.cpp
+++ b/src/military/military.cpp
@@ -2029,7 +2029,7 @@ float truce_break_cb_infamy(sys::state& state, dcon::cb_type_id t, dcon::nation_
 	return total * state.world.cb_type_get_break_truce_infamy_factor(t);
 }
 
-// Calculate victory points that a province P is worth in the nation N. Used for warscore, occupation rate.
+// US101AC4 Calculate victory points that a province P is worth in the nation N. Used for warscore, occupation rate.
 // This logic is duplicated in province_victory_points_text UI component
 int32_t province_point_cost(sys::state& state, dcon::province_id p, dcon::nation_id n) {
 	/*
@@ -6491,6 +6491,7 @@ float relative_attrition_amount(sys::state& state, dcon::army_id a, dcon::provin
 
 	auto max_attrition = std::max(0.f, state.world.province_get_modifier_values(prov, sys::provincial_mod_offsets::max_attrition));
 
+	// US101AC3 Forts increase hostile siege attrition by state.defines.alice_fort_siege_attrition_per_level per level
 	float siege_attrition = 0.0f;
 	if(state.world.province_get_siege_progress(prov) > 0.f) {
 		siege_attrition = state.defines.siege_attrition + hostile_fort * state.defines.alice_fort_siege_attrition_per_level;
@@ -6859,7 +6860,7 @@ float get_reg_org_damage(sys::state& state, dcon::regiment_id damage_dealer, dco
 	}
 	return dmg_dealer_str * (org_dam_mul / receiver_max_org_divisor) * (unit_dmg_stat * 0.1f + 1.0f) * unit_dmg_support * battle_modifiers / (fort_mod * dmg_receiver_stats.discipline_or_evasion * (1.0f + state.world.nation_get_modifier_values(dmg_receiver_tech_nation, sys::national_mod_offsets::land_organisation)) * (1.0f + receiver_exp));
 }
-// defines the general algorithm for getting the effective fort level with said amount of total strength of units who are enemies with the fort controller,
+// US101AC5 defines the general algorithm for getting the effective fort level with said amount of total strength of units who are enemies with the fort controller,
 // total strength of siege units who are enemies with the fort controller, and the highest siege stat among them.
 int32_t get_effective_fort_level(sys::state& state, dcon::province_id location, float total_strength, float strength_siege_units, float max_siege_value) {
 	/*
@@ -9047,7 +9048,7 @@ void update_siege_progress(sys::state& state) {
 			assert(bool(first_army));
 
 			/*
-			We find the effective level of the fort by subtracting: (rounding this value down to to the nearest integer)
+			US101AC5 We find the effective level of the fort by subtracting: (rounding this value down to to the nearest integer)
 			greatest-siege-value-present x
 			((the ratio of the strength of regiments with siege present to the total strength of all regiments) ^
 			define:ENGINEER_UNIT_RATIO) / define:ENGINEER_UNIT_RATIO, reducing it to a minimum of 0.
@@ -9056,7 +9057,7 @@ void update_siege_progress(sys::state& state) {
 			int32_t effective_fort_level = get_effective_fort_level(state, prov, total_sieging_strength, strength_siege_units, max_siege_value);
 
 			/*
-			We calculate the siege speed modifier as: 1 + define:RECON_SIEGE_EFFECT x greatest-reconnaissance-value-present x ((the
+			US101AC6. We calculate the siege speed modifier as: 1 + define:RECON_SIEGE_EFFECT x greatest-reconnaissance-value-present x ((the
 			ratio of the strength of regiments with reconnaissance present to the total strength of all regiments) ^
 			define:RECON_UNIT_RATIO) / define:RECON_UNIT_RATIO.
 			*/
@@ -9090,7 +9091,7 @@ void update_siege_progress(sys::state& state) {
 
 			float added_progress = siege_speed_modifier * num_brigades_modifier *
 				progress_table[rng::get_random(state, uint32_t(prov.value)) % 10] *
-				(owner_involved ? 1.25f : (core_owner_involved ? 1.1f : 1.0f)) / (effective_fort_level * state.defines.alice_fort_siege_slowdown + 1.0f);
+				(owner_involved ? 1.25f : (core_owner_involved ? 1.1f : 1.0f)) / (effective_fort_level * state.defines.alice_fort_siege_slowdown + 1.0f); // US101AC2 Forts reduce siege speed by alice_fort_siege_slowdown factor (0.75 by default) per level.
 
 			auto& progress = state.world.province_get_siege_progress(prov);
 			state.world.province_set_siege_progress(prov, progress + siege_speed_mul * added_progress);